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00:00Today we're going to learn even and odd numbers. A number belongs to one of two
00:06groups. Either it's an even number or it's an odd number. So what's going on?
00:11Why is this even a thing? We're going to talk about it.
00:18Even and odd is actually pretty easy, but it's just a matter of knowing what to
00:23look for. So we're going to be like detectives together, okay? You're going to
00:27have to have an eagle eye. To help us out on our quest, we're going to use dinosaurs.
00:34Dinosaurs are awesome. Here's a red dinosaur. I don't know why it's windy.
00:40There's wind going on. I don't know. Let's change the scenery.
00:45Let's make it more modern day. There you go. Look at that. Just walking through the
00:49neighborhood, strolling. He's ready to help us discover the secret, right?
00:57To knowing even and odd. So what is this key that we're looking for? What are we
01:03looking for that will tell us if a number is even or if the number is odd?
01:08An even number can be grouped by two. An odd number cannot be evenly grouped by
01:17two. So it's all about the number two and that might sound confusing. Let me
01:21show you and you'll see. Here is the easiest number to do. We're looking for
01:28the number two, okay? Can it be put in a group of two? Well, yes, because it's the
01:33number two. We've got two dinosaurs. That makes two even. Now this is odd. This
01:41dinosaur is all alone. He's not in a group of two. This makes the number one
01:46an odd number because he's all alone. That's odd. It's an odd number. Let's look
01:54back at the number two. See what's neat about this is it's an even group of two.
01:59That means our dinosaur has a friend. He can talk to his friend. He can hang out.
02:04It's not weird. It's not odd. It's an even number. Here we have three
02:10dinosaurs. Now can we put the number three in even groups of two? Well, no,
02:16because that third dinosaur is all alone. The top two dinosaurs have somebody. Three
02:20is odd. There's one that's missing a partner. Here we have four dinosaurs. Now
02:27we're looking for groups of the number two. Now we have two groups of two here.
02:32That means it's an even number. Each dinosaur has a friend. Wow, five dinosaurs.
02:41But look, one on the bottom doesn't have a pal, doesn't have a friend. That's odd.
02:48It's not evenly grouped into two. Five is an odd number. Hey buddy, okay, don't
02:55run. Okay, we'll get back to the even numbers. I know you don't like the odds.
02:59You don't like being the odd dinosaur out. It's okay. I promise this next number
03:03is going to be even because it goes for even, odd, even, odd. Just hang on.
03:12Dinosaurs, you know, so temperamental. I mean, what's that all about? I mean, a dog.
03:18A dog wouldn't have done that. You know, dogs are better, I think, now than
03:23dinosaurs. You know, I'm just kidding. Dinosaurs are so cool. Moving on. Here we
03:36have six dinosaurs. Now each dinosaur has a friend. That means six is even. You can
03:45split it up in groups of two. Oh, here we have seven dinosaurs, but there's one
03:54dinosaur that's all alone. Six of them have friends, but one is all alone,
03:59doesn't have a pair. Seven is odd. The number eight. Does everyone have a friend?
04:09Yes, there's no one without a friend. Number eight is an even number. It splits
04:15up into two very nicely. Eight is even. Let's go even higher. The number nine. Now
04:23you can see really quick, it's easy to spot. Is nine even or odd? Yes, it's odd.
04:30There's one who doesn't have a friend. Nine is odd. Oh my goodness, ten. Ten is an
04:38even or is it odd? You tell me. You know how to do it now. You know the trick. Yes,
04:45ten is even. Everybody has a friend. Now we're about to teach you two sneaky
04:54tricks that you can use with even and odd numbers, okay? So seriously, it's, well,
05:01it's not really sneaky, but anyway. So this first trick is that all of the
05:09numbers alternate from odd to even and back, and we're gonna show you what that
05:15means and what that looks like. Here we have the first ten numbers, numbers one
05:23through ten, and the trick was all of the numbers alternate from odd to even and
05:29back. Do you remember if number one is odd or even? Yes, number one is odd, because
05:40remember, number one's all by himself, doesn't have a friend, doesn't have a
05:43partner. It's not an even number. Number one is odd. Now we remember number two,
05:49right? Number two is even. Yes, because it can be grouped in two because it is two.
05:56Now, if they alternate, that means which one is number three? It's odd. This is
06:07where it gets fun. If three is odd, then that means four is even. Good job! And if
06:16four is even, that means five must be odd. Yeah! And if five is odd, that means
06:27six must be, you guessed it, even. And if six is even, that means seven must be
06:37odd. Yes, seven is odd. If seven is odd, that means eight is, come on, what's the
06:45pattern? Eight is even. And if eight is even, that means nine must be odd. And if nine is
06:54odd, come on, is this not just the most fun trick ever? If nine is odd, that means
07:01ten is even. They all alternate. So the first trick is that they alternate. The numbers
07:10alternate. Odd, even, odd, even, odd, even, odd, even, odd, even. Now we're going to look
07:18at the second trick. The second trick is that with numbers bigger than ten, if it's odd
07:25or even, you can see on the end. With numbers bigger than ten, if it's odd or even, you
07:32can see on the end. Odd or even. We're going to look at a number that's bigger than ten,
07:42and we're going to look on the end to see if it's even or if it's odd. Our first one
07:48is the number twenty-one. Is it odd or is it even? It's odd. How? Why? Well, we look
07:58on the end. The end is a one. A one is odd. It's all by itself. A one is odd, so twenty-one
08:07is odd because one is the ending. Did you know that means seventy-one is odd, and one-hundred-and-one
08:18is odd, and one-hundred-and-thirty-one is odd, and the number one-thousand-and-one is
08:24odd. Why? They all end in one. Let's try this one, the number thirty-two. Is it odd or is
08:33it even? Thirty-two is even. Well, how do we know? Because of the ending. Look at the
08:42ending. It's the number two. Two is an even number because it's a group of two. It can
08:47be put in groups of two because it is two. The same rule applies. This is the second
08:53trick. With numbers bigger than ten, if it's odd or even, you can see on the end every
09:00single number that you can think of ends in two is an even number. Let's try one that's
09:12a little more tricky. Let's try the number one-hundred. Is one-hundred odd or is it even?
09:28It is even! It's even, and we know that because of the ending. It ends in a zero. Now remember
09:35our second trick. With numbers bigger than ten, if it's odd or even, you can see on the
09:42end an ending is a zero, and every number that ends in zero is even. Let's look at the
09:49chart again. As you can see, ten on the bottom ends in zero, and it's even. Every single
09:57number that ends in a zero is even, just like every number that ends in a one is odd. Every
10:04number that ends in a two is even. Every number that ends in a three is odd because three
10:11is odd. Every number that ends in a four is even, and it goes on and on. Numbers that
10:17end in five are odd. Numbers that end in six are even. Numbers that end in seven are
10:23odd. Numbers that end in eight are even. Numbers that end in nine are odd, and the numbers
10:35like ten that end in zero are always even. So there you go. Odd and even. As long as
10:44you learn these, you'll know any number because the endings always tell you if it's odd or
10:50even. So once you know these, you'll know all of them.
11:02Well, that wraps it up. Even and odd. Such a fun way to describe numbers. Numbers are
11:10either even or odd, and now you know the secrets. Now you know how to tell whether
11:16a number is odd or even. Thanks for hanging out!