Twins

I have a twin sister. We share everything, but sometimes when we share things, it doesn’t come out even. She gets more than me. I wonder why that happens.

Look at these marbles. Will my sister and I get the same number of marbles?

We found that if numbers make pairs, we can share them evenly. We call these even numbers.

	Mine	Sister's	Left over	Even or Odd
2				even
4				even
6				even

All numbers that make pairs but have 1 left over are called odd numbers.

	Mine	Sister's	Left over	Even or Odd
1				odd
3				odd
5				odd
7				odd

Click only the even numbers on this chart.

Odd	Even
1	2
3	4
5	6
7	8
9	10

Even numbers are used when counting by 2s.

Are these numbers odd or even? Click the word that tells about each number.

68
41
25
70

Click on the marble to get a hint.

Now that we know about odd and even numbers by looking at pairs and by counting by 2s, let’s look at some really large numbers.

436,973,751

Wow! That is a really big number. Is it odd or even?

No matter how large or small the number, we can look at the digit in the ones place to know if the whole number is odd or even.

Odd	Even
1	2
3	4
5	6
7	8
9	10

4,927

The 7 in the ones place is odd so the whole number is odd.

I think I've got it!

Let’s practice a few more just to be sure we can tell if a number is odd or even.

3,089
22
64,241
907
5,300

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There are two of us so we are an even number.

BUT

There’s only one of you. Are you odd?

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