What does it mean to 'compose' numbers?

Composing numbers means putting smaller numbers together to make a bigger number.

What does it mean to 'decompose' numbers?

Decomposing numbers means taking a bigger number apart into smaller numbers.

You could have 2 apples in one group and 3 apples in the other group, or 1 apple in one group and 4 apples in the other group.

1st GradeMath45 min

aligned to Ccss 1.oa.b.4

I can use fact families to solve addition and subtraction problems.

8 min

Composing Numbers & Decomposing Numbers! | Mini Math Movies | Scratch Garden

Scratch Garden

9 min

Key concepts students will learn:

•
Composing numbers is when smaller numbers are put together to make a larger number.
•
Decomposing numbers is when a larger number is taken apart into smaller numbers.
•
The number 7 can be composed of the numbers 3 and 4, or the numbers 5 and 2.

14 min

9 questions • Multiple choice & Short answer

5 min

“If 3 + 4 = 7, what are two subtraction problems that use these same three numbers?”

Get the complete package: