# 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

$$4 + 3$$

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