2nd Grade Math CompilationMay 30, 2021
wow we're going to learn a lot of great stuff in this homeschool pop video ok so what's the first thing we need to learn about perimeter? I have fun with my car, okay, this is a perfectly good car to race in, it's very fast, it's got the bells, it's got the whistles, it's a great race car. i am driving on the right turns around an oval turns around a shape if i was wondering how far it is around the track what is the distance around the shape then i would need to know the perimeter the perimeter is the distance around a shape wait wait what is the perimeter the perimeter of a shape is the distance around a shape and it's easy to find you can find the perimeter of a shape by adding up all the sides which will tell you the distance around the shape great now let's practice finding the perimeter lo Okay, in this triangle, what is the perimeter of this triangle?
Ok, first we need to know how long all the sides are, then we can calculate the perimeter with this triangle, all three sides are the same length, so how long are they? Suppose we measure and each side is 10 centimeters now remember to find the perimeter of a shape we need to know the distance around the entire shape so we just add the sides together what is ten plus ten plus ten that is three tens which is the same if thirty awesome the perimeter of this triangle is 30 centimeters remember that cm is short for centimeters 30 centimeters is the perimeter of this triangle ok let's try this what is the perimeter of this square first we need to know how long all the sides of the square are and then i can figure out the perimeter of the square ok so this is a square it has four sides and all four sides are the same size let's imagine we measure it and each side is one yard remember yd is an abbreviation for r the distance of a yard, each side is a yard, remember that the perimeter is the distance around a shape, so we will have to add all these sides , okay, what's one plus one plus one plus one, yeah, four?
The perimeter of this square is four. yards the perimeter remember is the distance around a shape if you had to go around this whole square it would be four yards ok this is the last one what is the perimeter of this rectangle well first we need to know how long are all the sides of the are the rectangles then we can calculate the perimeter remember that a rectangle has four sides and two of the sides are shorter than the other two sides with this rectangle we are going to pretend that we measure it by one meter on the short sides and three meters on the longest sides ok remember to get the perimeter we have to add all the sides so we are going to add four numbers again to make it easier we are going to group the smaller numbers together and then we will put the larger numbers into our equation what is one plus one plus three plus three those are all the sides what is one plus one plus three plus three yes eight that means the perimeter of this rectangle is eight meters wow we told you it would be fun oh it's great finding the perimeter he is so fun finding the perimeter it's like a game remember you can find the perimeter of a shape by adding all the sides and the perimeter of a shape is the distance around a shape now you know how to find the perimeter of something perimeter is the distance around a shape.
I could find the perimeter of this tablet correctly. All I would have to do is measure each side and add them up and I would find the perimeter, but right now I have to find an internet connection. There is no wifi. out here there's no reason to be in the desert i need water it's not this doesn't make any sense ok so i'll go you go ahead and find the perimeter enjoy the perimeter is the distance around the shape go have fun thanks for watching we are so happy of having you with us i mean you are so amazing you really are oh you like my poster mr whiskers poster you know its very good very good you know its a very good poster very good cat too i wonder what would you like to learn about next if you learned from one of our videos what would you like to learn next hmm how about we learn about fractions fractions are so amazing and so much fun that many of you also think so a couple of weeks ago we ran a poll on our channel and many of you voted for fractions like our next
mathvideo which is really awesome thank you all for voting and don't worry we will do the other d The videos too later, but this is all about fractions, okay, well, let's start here. is a fraction when we say the word fraction what do we mean what is a fraction well a fraction is something that shows parts of a whole let's say there is a lady named cindy cindy has a pizza that is great she loves pizza so yummy pizza but then his friend chomsky here you see remember chubs chomsky likes pizza too and he's a little hungry so maybe cindy won't eat all the pizza now maybe they'll split it what do you think? so they cut the pizza in half each gets half the pizza it's not ordered and everyone has pizza each gets half the pizza they split it in half now remember that a fraction is something that shows parts of a everything so this is what the fraction looks like one per line and a two which is the fraction half each of them cindy and chomsky get half the pizza so this is half is a very important fraction because the we use it all the time now you may be wondering what the numbers mean and how it shows half ok the bottom number shows the total number of parts the top number shows how many parts we are talking about pretty simple let's go back to our example there is a total of two parts on the pizza so there's a two on the bottom and Cindy only gets one part which is t The part we're talking about is Cindy only gets half the pizza.
She doesn't keep everything. She keeps a part. She gets half. The bottom number of a fraction is called the denominator. The denominator is the total number of parts the top number is called the numerator the numerator tells us how many parts we are talking about in this case cindy is eating one part of the pizza the other part of course goes to chomsky lets try this let's say there is another pizza and this pizza has four parts the number four is the denominator because there are four slices of pizza four parts let's say kelly shows up and wants to have one slice of pizza one slice of pizza the numerator or the top number of the fraction is the number one because kelly eats a part or a piece of pizza kelly eats a quarter of the pizza very simple very funny fractions are great now we are going to need your help help us figure out what fraction is what fraction is good we are going to pass a good time let's say we have a group of five sports balls one is a basketball the other four are soccer balls let's find out what fraction of the balls are pe lots of basketballs what fraction of the balls are basketballs then we know that a fraction has a line down the middle and the top number is the numerator and the bottom number is the denominator the denominator shows us the total number of parts or units how many sports balls are there yes five five is the denominator good job now remember we are asking for the fraction of sports balls that are basketballs so how many basketballs are there yes only one number one is the numerator so one fifth of the sports balls are basketballs one fifth great job lets try this last example lets say there are five pets five pets two of them are dogs and three of them are cats what fraction of the pets are cats huh that's a good question what fraction of pets are cats remember this is what it looks like a fraction has a line in the middle m with the top number yes I end the numerator and the bottom number is the denominator so the total number of pets is five which number is the denominator which number goes on the bottom yes five five is the denominator it tells us the total number of pets remember us I'm asking by the fraction of pets that are cats.
How many cat are? Yes, three, what is the numerator? Yes, three three is the numerator. to me like you mr whiskers not even a fraction of my heart belongs to my whole heart i love you mr whiskers i do i do a fraction is something that shows parts of a hole top number of a fraction is the numerator, how many parts do we have. we're talking and the bottom number of a fraction is the denominator the total number of parts oh wow look it's the homophone cow homophone cow eh homophone cow you're just walking around you're just going to ignore me look how it's ok so you're upset about it we didn't include you in other videos.
What do you call this? learn to multiply and if that sounds really scary or if it sounds like something difficult it's just because you don't know how to do it yet once you learn the game once you learn the process it's fun it's amazing you see multiplying it's like being a detective you're cracking a code that's cool you're solving mysteries like legitimate mysteries like i'm in an office building right now there's a cake behind me for some reason i'm looking right now guys i see you're like whoa let's multiply and once you learn that its just a game so buckle up for fun and learning lets say you have two bikes and for some reason they look exactly the same and someone wants to give you an air pump they ask you a simple question how many tires do you have to take care of yourself to realize of that?
We are going to use multiplication. Let's play. It's going to be amazing. Good. This is how multiplication works. x which means times and then the number of groups which tells us how many times that number will appear and then we add them all together and you have your answer its not that great and just a side note to work there has to be the same number in each group now remember we are trying to figure out how many tires you have to take care of if you have two bikes ok now we have the wheels under each bike each bike has two wheels one two so we write a two each bike has two wheels remember the first number that we write with the multiplication is the number of each group, then we write an x, this x means multiplied by two, it is the symbol of multiplication, okay, the second number that we write is the number of groups you can see here how many gr Oops, do we have two?
How many, yes two? So read two times two to figure this out let's skip count by two two four that means two times two equals four if you have two bikes that means you have four wheels two two times four remember that's how multiplication works the number in each group times the number of groups equals your answer of course to work there has to be the same number in each group ok let's take this to the next level let's say someone has four bikes and here are their wheels do you know how to do this now each bike has two wheels so the first number we write is the number two that's the number in each group we're going to put the time symbol there and we'll count the number of groups one two three four so that's two times four this is it very funny this is multiplication now let's skip the count to get the answer two four six eight eight is our answer there are eight wheels two times four equals eight this is how multiplication works we put the number i n each group multiplied by the number of groups and we get our answer.
You are learning well. Let's try this one. Let's say you buy three packs of trading cards. Let's say each pack had five cards. quantity so three packs of five cards how many cards did you get in total that's a very good question it looks like we're going to need to multiply so that each group has five so that's the first thing we write the number in each group which is five put the sign of multiplication which is the x which means multiplied by five by how many groups there are one two three then the second number is three five times three what is five times three we are going to skip count to find out 5 10 fifteen five times three equals fifteen, you have fifteen cards, this is how it works, you take the number of each group multiplied by the number of groups and you get your answer.
Multiplication problems very very fast this is the trick if you multiply any number by zero you always get zero you always get zero here is an example five times zero equals zero when you have zero groups of five that means you have zero there is none every time you multiply any number by zero you always get zero one hundred times zero equals zero even if zero is the first number in the equation you always get zero when you multiply by any number, for example zero times eleven equals zero and zero times 1000 equals to zero if you multiply any number by zero you always get zero oh this has been so much fun here is the next trick if you multiply any number by one it stays the same look at these seven times one equals seven one hundred times one equals one hundred thirty three times one equals thirty-three if you flip them overthe answer remains the same one times seven equals seven one times one hundred equals one hundred one times thirty three equals thirty three honestly the order of the numbers multiplied does not change the answer.
If you flip the number of groups and the number in each group you would still get the same answer, although we still recommend this way, so just the number in each group times the number of groups to get your answer then the two tricks have been if you multiply any number times zero you always get zero and if you multiply any number by one it stays the same the ultimate multiplication trick is to use multiplication tables they come in all shapes and sizes but they are all useful especially when you are learning to multiply for the first time here are some examples of times tables there is a table for all the numbers from 1 to 10 some kids memorize tables like these so they know right away what the answer might be for certain multiplication problems this is how multiplication works the number in each group multiplied by the number of groups gives us our answer oh this is such a heavy car oh my god oh is u n hard work I You know that many times learning can also be hard work, but we hope that these videos are really useful.
They make learning fun so learning isn't as hard as pushing this cart. about 3d shapes this is going to be awesome i love 3d shapes a lot of people know 2d shapes you may not know 3d shapes you are in the right place before i start let me dance here real quick this is great music i really like this you know i like dancing you know some people aren't dancers you know i dance i get in and dance you know ok that's enough someone can turn off that music and i really can't i can't teach like this i can't teach with this music playing you know i feel like i'm in a candy store let's turn the music off please thank you so here are our old friends the 2d shapes you're familiar with i know you're familiar with the circle the oval the triangle t the pentagon the trapezoid the hexagon the square the rectangle the parallelogram and the octagon and these are not all our our shapes our 2d shapes you know but these are all our family friends we don't want to forget about these and before we look at the 3d shapes it's very important for us to look at these shapes again because they are old friends so we are going to look at each of them one by one to make sure you know who they are before that we learn all this news. shapes this first shape doesn't even need an introduction it's the circle the circle that round shape is amazing we love this shape it's one of the first we learn the circle this next shape is one of the stretchy shapes the oval is like a the circle stretched out it's elongated it's a tremendous shape the oval here's another familiar shape the triangle three sides we love triangle the triangle is great three sided friend three sides a triangle wait i keep saying we love shapes i mean we like shapes but do you love shapes?
I love shaves? I mean, I don't know, I need to take it easy here, okay, let's continue ah, the square, all four sides, all the same, you know the square is good, the square. it's a good shape you know sometimes you just need a square sometimes you just need a square here's the rectangle the rectangle is longer than the square why not all four sides are equal the rectangle i know i know we're in the middle of something here but i have to show this ok so what do you call a hamster in a top hat open hamster lincoln i digress the trapezoid a cool shape with two of the sides parallel to each other in the parallelogram another four sided shape both pairs of sides are parallel each other and finally the pentagon with five sides, the hexagon with six sides, and the octagon with eight sides, what amazing shapes, so let's go ahead and do a quick quiz on 2D shapes.
I need your help. I want to see if you really learn these. if you really know the mira, before i get into the 3d way so help me here we are going to have an amazing time wait what is that? My birthday, well, what kind of shape is on top, yes, a circle, what kind of shape is in the middle, a square. amazing good now which shape is on the bottom of course a triangle great job now we have more this is a bit more complicated which shape is in the middle yes a trapezoid whose shape is on the right , the pentagon, good job and what shape is on the left, yes, the square, now try these, whose shape is on the bottom, yes, the oval, whose shape is on the top, yes, the parallelogram, whose shape is in the middle ok the rectangle good job ok the last one whose shape is on the left yes the hexagon whose shape is on the right gray the octagon and what shape is in the middle great the pentagon ok we are ready to learn the 3d shapes we are going to learn how to identify the 3d shapes if you have a hard time completing the quiz you might want to watch the first part of the video again otherwise let's get started so as we start it's important to remember what makes a form 3 D be a 3D shape.
There's an old rhyme that 3d shapes are thick not flat and you can see that with the sphere that's a 3d shape that we're about to learn about and the circle the circle is flat but the sphere is 3d it's three dimensional all shapes are so so let's learn all these 3d shapes so the first 3d shape we're going to learn is the sphere the one we just mentioned the sphere is the 3d version of the circle it's perfectly round there are spheres around us one of the spheres we see all the time time it's balls like this soccer ball a soccer ball is a sphere it's perfectly round it's a 3d circle it's a sphere you know this sphere yes it's the earth it's where we live our planet is a sphere how cool is it that our own planet is a perfectly round sphere is a sphere in this image we have two spheres can you identify them yes? the two spheres are the two skittles balls perfect round spheres the spheres are all around us here we have a group of three spheres and you can count them right now one two three spheres all together the shape of a ball a perfectly round sphere well there you have it the sphere what a cool 3d the shape to start with is round there are examples all around us and it's cool and you know what 3d shapes are going to get even better our second 3d shape is the cone the cone is a really cool shape with a circle as the base or the bottom and everything reaches a point called the vertex.
This is an example of a cone. I think we all love the ice cream cone. If it doesn't have ice cream inside and you flip it over, you could. look at the base of the circle and everything comes to a point called the vertex here there are two cones a red cone and a blue cone and you can see that both cones have that circular base and everything comes to a vertex what wonderful cones have you seen these before they are traffic cones here are a lot of cones we don't count them all but there are a lot and they are wonderful wonderful cones so that's our second 3d shape the cone a wonderful cone with a big circular base it all comes to a point called vertex, how awesome is our third 3D shape. the pyramid I love the pyramid the pyramid is great it reaches a point like the cone except that the base is a square and the sides instead of being smooth are triangles well how are these great these are great the pyramids of egypt look what they have the triangular sides and the bases of these pyramids are square they are amazing examples of the pyramid this is a very cool pyramid it is a decoration that attaches to the wall but it is a great example of what a pyramid looks like down below or the base is square and there are the triangles on the sides how cool is this here is another pyramid and it is made of glass there are so many decorations and things around maybe even your house that is shaped like a pyramid because pyr in the middle they look so cool people love to put them in everywhere and there you have it i mean you know the pyramid has a good shape you know you see a lot of them around they have the square bottom or the base and the triangles on the sides and t Everything goes up to a vertex it's a classic shape it's pretty awesome our fourth 3d shape is the cylinder now a cylinder is easy to spot because it has a circle on top and a circle on the bottom and it's smooth all around here we have a soup can and it's a cylinder it has a circle on the top a circle on the bottom and it's smooth all around all the cans and most of the jars are cylinders here we have three cylinders they are candles and i can tell you a secret most of the candles are cylinders two okay oh my god this is too crazy and too amazing here are two more cylinders are you kidding are you kidding even the batteries are cylinders the cylinders are seriously everywhere a circle on top a circle on the bottom and smooth all around i mean really the cylinder er is everywhere i mean you know the circle on top the circle on the bottom sua look all around i cylinder like what the hell do you have to be everywhere ok the next 3d shape is the cube the cube is the 3d version of the square it has six sides or faces that are all square here we have two dice the dice are shaped of cube so these two dice are two cubes they have six sides or faces that are all square here we have many cubes these are cubes that are made of wood each of them has six sides or faces that are all square here are seven ice cubes Have you ever had a hot drink and you need to put ice on it it's amazing because it has this great shape the shape of a cube six sides or faces all squares i mean there you have the right cube the 3d version of a square and it has squares along it the right sides there are six sides or faces all the squares and I don't know I think it's great to shape our final 3d the shape is the rectangular prism the rectangular prism is the 3d version the rect version angle has six sides or faces that are all rectangles ok an amazing example of the rectangular prism is bricks and here we have four bricks that are four rectangular prisms the 3D version of the rectangle you may have seen this in your living room classes or at home it's a tissue box and the tissue box is a great example of the rectangular prism it has six sides or faces that are all rectangles ok so the secret is most boxes are rectangular prisms so here's another one rectangular prism and it's a box and it's a shorter box but it still has rectangles around it and it's a rectangular prism, what else can we say? it's a cool shape the rectangular prism is the 3d version of the rectangle it has six sides or faces that are all rectangles and it's just a neat shape to have around i think i mean yeah let's go over pyramid cylinders sphere cylinder cones rectangular pyramid prism spheres let's do a little more on top here we have cubes we can tell that because it uses the 3d square it has six sides or faces each of them are squares it's cool do you remember what shape these bricks are yes a rectangular prism they are rectangular prisms they are the 3d versions of the rectangle at the top we have a cone a cone has a circular base at the bottom and it all comes to a point called the vertex do you remember the shape here at the bottom these are three cylinders they have a circle on top and a circle on the bottom and it's smooth around you you're doing an amazing job seriously great so what's this top shape?
Remember? Yes, it is a pyramid a pyramid a pyramid has a square base, comes to a vertex or a point, and has triangles as all sides. right, do you remember this last shape here at the bottom? yes it's the sphere the sphere which is the 3d circle and we're starting with it and we're ending with it and it's so awesome hey whoa ok first of all elephants don't drive well elephants can't get a driver's license se and he's driving on the grass he's driving on the grass you're going to ruin the grass it's ok what's going on here it's ok this is out of control it's ok elephant i don't want to tell you what you can do what you can't do but you can't drive well oh my gosh ok now we are going to learn about roman numerals which is a different way of writing numbers and it was used a long time ago in ancient rome and has been used ever since and you can think of it almost as a secret code way of writing the numbers, it's pretty simple to learn and we're going to see that the first roman numeral we're going to learn is the roman numeral i and i is one i equals one so if you see an i with a roman numeral it's a or the letter v is the roman numeral which means five and the letter x is the roman numeral which means ten so when you think one is an i you think five is a v and if you think ten is an x so it's just those three i almost seem one that's how you can remember that i is a one i is the roman numeral for one a v is in the number five when you spell it the number five you see it has a v right there so when you think of v you know oh you know what's upa v in the spelling out the number five so v has to be five now so is x and we can't think of anything to remind us of that so there's no memorizing thing just when you see x is 10 and that's just what we'll have to get it right one last time here i just want to make sure you understand there are only three i is the roman numeral for one v is the roman numeral for five and x is the roman numeral for ten and you have to understand that so we can start playing kind of a game of putting them together and making numbers other than just 1, 5 and 10. so let's get started so let's practice putting these roman numerals together what number do you think this is? you see two eyes and i is one so the answer is two two i's is the number two what about this? one what number do you think it is?
There are three eyes, yes, it is number three. Let's try this one. What number do you think it is? We see two x's and x equals ten, so ten plus ten equals twenty. this is cool ok an x and a v what number do you think the x is it's a ten the v is the number five awesome so what's ten plus five fifteen whoa thanks so much for helping now that we have seen it? how to put some of these together i want to tell you about two special numbers that are a bit different so you'll have to remember them on your own the first is the number four and the number four is represented by an i and a v and the i is before the v because four is one less than 5 which is v so remember with 4 is i v with 9 is similar except with x 9 is i x x is 10 and i is right before nine is i x ok that was really cool thanks for hang out and learn that with me, but we're not here.
We want to review all the numbers up to 30 just using the numbers and I want to see how much you've really learned so if you do me a favor as the numbers go up I want you to say the numbers along with me and we can practice together sounds good good let's get started one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen 18 19 20 21 22 23 24 25 26 27 28 29 and 30. well there you have it a new way to write numbers wow mommy you are doing a great job on your career, I had no idea you were an athlete, okay, I mean, with all that cloth wrapped up, you're doing great, you're doing a great job just like these kids are doing a great job learning, actually, how about this, the next thing we're going to learn is that division is an amazing thing you can do and you're going to have it all figured out. we are going to learn dividing in this video and we are going to start with a story about this boy named ethan and ethan loves carrots he loves carrots so much he loves to chop them he loves when he eats them they are crunchy they are tasty yeah carrots are great i'm actually literally eating a carrot Talking carrots are great for your skin carrots are great for your eyes they're great you're a great snack and ethan loves them so much ethan has two friends over kevin and chloe and they're starting to get hungry of course they a everyone loves carrots because carrots are like the perfect snack now at ethan's house there are only three carrots it's only three carrots we're going to have to divide the three carrots among the three kids so let's find out how many carrots each kid gets you know? uh-huh each kid gets a carrot pretty simple right three carrots three kids each kid gets a carrot hey did you know we just did the division uh-huh we just did the division division is pretty simple you'll see that division is dividing a number by any given number that's just s dividing a number let's look at our story again there were three carrots and we divided those three carrots by three because there are three people the three kids who love carrots and the answer to how many carrots each kid gets is one three divided times three equals one notice here is the division sign this is what it looks like when you see that sign you might say divided by then this says three divided by three equals one lets try another division example lets say there are eight presents eight presents and there are four women and we want each of the women to receive the same amount of gifts as the other women because we want it to be fair look at the division sign let's divide or divide eight by four remember to divide is to divide up let's divide these presents into four equal groups one two three four ok how many presents each woman gets uh two each woman gets two presents isn't that cool? division is so much fun and so easy to remember mber division is dividing a number by any given number that's it now it's time for division. ok just look around you ok make sure it's ok who is clear ok it's time to divide the facts the first fact is you can never divide by zero that's right you can never divide by zero, even if you're a rule breaker and you're like I'm going to do whatever you want, you can still never divide by zero, in fact if a teacher ever gives you a test and you see a problem where you have to dividing a number by zero right in the undefined test because that's exactly what that answer would be undefined is impossible something like mr whiskers
mathskills does mr whiskers do math in his head all day who knows his math skills aren't up definite we just don't know it's impossible to know you know mr whiskers might know how to do division who knows indefinite you can't divide by zero you can never divide by zero if you ever see any division problems divide r for zero just write undefined it's impossible it's impossible so just write undefined the second fact is this you can write the division sign in three ways not just with that traditional division sign you can write it as the division sign or you can write a problem of division with the slash or with a horizontal line, for example, look at this 12 divided by 3 equals 4, that's the original division sign that you would see more regularly but here is the same equation written in a way different twelve divided by three equals four is still a division sign but it is a slash means the same as the original division sign remember that the division sign can also be a horizontal line twelve divided by three equals four which looks like a fraction doesn't it? the line in a fraction means divided by these are the three ways you can write the division sign pretty interesting all right the final fact is ok this is so awesome you can flip the number of groups and the number in each group and the division problem is still true eg ten divided by two equals five and you can flip the two and five and it's still true that means ten divided by five equals two isn't that interesting? ten divided by two equals five and ten divided by five equals two you can flip the number of groups and the number in each group and it's still true or look at this eighteen divided by six equals three remember we can reverse the number of groups and the number in each group and it's still true so we can flip the six and the three and it's still true so 18 divided by three equals six the six and the three can be flipped so 18 divided by six equals three and 18 divided by 3 equals 6 pretty nifty those were some cool facts you know division is a great time division is dividing a number by any given number it's a lot of fun and we hope you learned a whole lot in this video wow completed the video that is so awesome you may notice there is a circle right here on this video page that you can click to subscribe to our channel or you can click this rectangle to go to another from our videos but keep learning learning is great
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