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Adding Subtracting Parts

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Adding Subtracting Parts worksheet preview

Adding Subtracting Parts

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📚 Part 1: Adding in Parts (0-20)

1. Break apart the second number to make adding easier. Fill in the missing parts:

Example: 14 + 5 = 14 + 4 + 1 = 18 + 1 = 19

a) 13 + 8 = 13 + _____ + _____ = _____ + _____ = _____

b) 16 + 7 = 16 + _____ + _____ = _____ + _____ = _____

c) 12 + 9 = 12 + _____ + _____ = _____ + _____ = _____

2. Choose the best way to break apart these addition problems:

For 15 + 6, which breakdown helps most?

15 + 3 + 3

15 + 5 + 1

15 + 2 + 4

✏️ Part 2: Subtracting in Parts (0-20)

3. Break apart the second number to make subtracting easier:

Example: 16 - 7 = 16 - 6 - 1 = 10 - 1 = 9

a) 18 - 9 = 18 - _____ - _____ = _____ - _____ = _____

b) 15 - 8 = 15 - _____ - _____ = _____ - _____ = _____

c) 17 - 6 = 17 - _____ - _____ = _____ - _____ = _____

4. Solve these problems using the "parts" strategy. Show your working:

a) 14 + 8 = _____

b) 19 - 7 = _____

c) 11 + 9 = _____

🌟 Part 3: Challenge - Bigger Numbers!

5. Apply the same strategy to larger numbers. Break them into tens and ones:

Example: 46 + 29 = 46 + 20 + 9 = 66 + 9 = 75

a) 35 + 28 = _____

b) 67 - 39 = _____

6. Explain in your own words: How does breaking numbers into parts help you add and subtract?

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