Composing and Decomposing Numbers
This worksheet helps second-grade students practice composing and decomposing numbers using various strategies.
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Composing and Decomposing Numbers
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Read each question carefully and follow the instructions to compose or decompose the numbers.
1. What number do you get when you put together 3 tens and 5 ones?
2. Compose the number with 7 tens and 2 ones.
3. If you have 40 + 8, what is the composed number?
4. What is 50 + 9?
1. Decompose the number 47 into tens and ones.
2. How would you break down the number 83?
1. Which of these shows a way to decompose 65?
6 + 5
60 + 5
65 + 0
50 + 6
2. What number is composed from 9 tens and 1 one?
19
90
91
100
1. Use the number line to show how you can decompose 15 into two parts.
1. The number 28 can be decomposed into 2 tens and 8 ones.
True
False
2. Composing 1 ten and 1 one gives you the number 11.
True
False
Match the decomposed form with the composed number.
1. 3 tens and 4 ones
a. 56
2. 50 + 6
b. 34
3. 8 tens and 0 ones
c. 80
Explain in your own words what it means to 'decompose' a number. Give an example.