You will learn that whole numbers can be put together to compose a greater number. Whole numbers can also be broken apart to decompose into two lesser numbers!

**To better understand composing & decomposing numbers…**

## LET’S BREAK IT DOWN!

### Decompose a number

Decomposing a number means taking a whole number and breaking it into two smaller parts. To decompose the number 5, you can break it into smaller parts of 4 and 1, or 3 and 2.

### Use a number bond to show parts.

A number bond is a tool you can use to show parts of a whole. A number bond has one circle on top and two circles on the bottom. The top number shows the whole. The bottom numbers show the parts.

### Decompose 8 using a number bond.

To show 8 in a number bond, put 8 in the top circle. Then the parts go in the lower circles. 2 and 6 make 8. 2 and 6 can go in the lower circles.

### Compose a number.

Composing a number means taking two lesser numbers and combining them to make a greater whole number. A group of 4 and a group of 2 make 6.

### Compose 9 using a number bond.

9 goes in the top circle. 6 and 3 make 9 so the numbers 6 and 3 can go in the lower circles. You can say 6 and 3 make 9 OR 3 and 6 make 9.