# Unit 5 Composing and Decomposing Numbers to 10 (Family Materials)

In this unit, students compose and decompose numbers to 10 in different ways. We call this “making” and “breaking apart” numbers.

Near the end of the unit, ask your student to draw a picture that goes with this story:

At the market, you get 10 apples from a bin.
Some of the apples are green and some of the apples are red.
How many of the apples are green?
Then, how many of the apples are red?

Questions that may be helpful as they work:

• Explain your picture to me.

• How many green apples and how many red apples did you draw?

• Does this story match the expression , , , or ? How do you know?

• Is there another way you can make 10 apples?

## Section A Make and Break Apart Numbers to 9

In this section, students compose and decompose numbers to 9. At first, students only work with numbers up to 5 to build fluency with addition and subtraction within 5 as they compose and decompose numbers in different ways.

Students understand that there are different ways to compose and decompose a given number. They work with physical objects, such as counters and connecting cubes, that they can use to compose and decompose numbers.

6 is 3 and 3

6 is 4 and 2

6 is 5 and 1

## Section B More Types of Story Problems

In this section, students represent and solve story problems. Students compose and decompose numbers as they solve story problems where both addends are unknown. For example,