Composing numbers is like building with blocks! You take smaller numbers and put them together to make a bigger number. Decomposing is the opposite – you take a bigger number and break it down into smaller numbers. For example, you can compose the number 5 by adding 2 and 3 ($2+3=5$). You can decompose the number 7 into 4 and 3 ($7 = 4+3$). This worksheet will give you some practice!
Match the word with its definition:
| Word | Definition |
|---|---|
| Compose | Putting numbers together |
| Decompose | Breaking a number apart |
| Sum | The total when adding |
| Number bond | A picture that shows how numbers join together or split |
| Addend | A number that is added to another |
Use the words compose, decompose, addends, sum, and number bond to complete the sentences:
1. To _______ a number, you break it apart.
2. To _______ a number, you put it together.
3. The numbers you add together are called _______.
4. The answer you get when you add is the _______.
5. A _______ visually represents the relationship between numbers.
Can you think of three different ways to decompose the number 10? Show your work!
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