# Lesson Worksheet: Identifying Odd and Even Numbers: Pairing or Grouping Mathematics • 2nd Grade

In this worksheet, we will practice deciding if a number up to 20 is even or odd by investigating whether you can divide it into two equal groups without any remainders.

**Q4: **

A number is **odd** if we **cannot** split it into groups of two with nothing left over.

If we try to split these 9 squares into groups of 2, there is always one left over. So, 9 is odd.

Which of the following numbers is odd?

- A
- B
- C
- D

**Q5: **

Every child has a partner to work with.

Is the total number of children even or odd?

- Aodd
- Beven

**Q7: **

David is using a ten frame to see if numbers are even or odd. He colors 6 squares in the ten frame and tries to pair each square in the top row with the square under it.

He sees that he can divide 6 into three pairs, so 6 is an even number. Then, he colors 9 squares in the same way.

He sees that he cannot divide 9 into pairs. There is one left over, so 9 is an odd number. Now, it is your turn. Pick the ten frame that shows that 7 is an odd number.

- A
- B
- C
- D
- E

**Q8: **

These children wanted to work in pairs but there was one child left.

Is the total number of children even or odd?

- Aodd
- Beven

**Q9: **

Is the number of circles in the figure even or odd?

- Aeven
- Bodd

**Q10: **

A number is **even** if it can be split into **two** groups of **equal** size.

These 6 squares can be split into two groups of 3 squares. So, 6 is even.

Which of the following numbers is even?

- A
- B
- C
- D
- E