# K.5 Composing and Decomposing Numbers to 10

## Unit Goals

- Students compose and decompose numbers within 10.

### Section A Goals

- Compose and decompose numbers up to 9 in more than 1 way.
- Write expressions to represent decompositions.

### Section B Goals

- Solve Put Together, Total Unknown, Put Together/Take Apart, Both Addends Unknown, Add To, Result Unknown, and Take From, Result Unknown story problems.

### Section C Goals

- For any number from 1 to 9, find the number that makes 10 when added to the given number.

### Glossary Entries

**above****add**\(4 + 3\)

Four plus three

**below****beside****circle****equation**\(10 = 6 + 4\)

\(5 - 2 = 3\)

**expression**\(6 + 4\)

\(3 - 3\)**fewer****less**3 is less than 9

**longer**The straw on the top is longer than the straw on the bottom.

**more****next to****number writing reference**1

one

2

two

3

three

4

four

5

five

6

six

7

seven

8

eight

9

nine

10

ten

**rectangle****shorter**The straw on the bottom is shorter than the straw on the top.

**subtract**\(5 - 2\)

Five minus two

**triangle**