Practice Problems — Set 18

1.OA.D.8 · Determine the unknown whole number in an addition or subtraction equa…

Print and write your answers. Use diagrams to show thinking.

Warm-up

1. 6 + 5 = ___ 2. 11 − 5 = ___ 3. 34 − 6 = ___

_See printable PDF for diagram._

Written practice

1. Two-step: Start with 9, add 3, then subtract 1. Result? ___ 2. Explain your thinking for this word problem in one sentence. 3. Create your own word problem for 1.OA.D.8. 4. Story: 5 apples and 4 more arrive. Total? ___ 5. Story: 5 apples and 4 more. Total? ___ 6. Story: 9 stickers, give away 4. Left? ___ 7. Story: 9 stickers, give away 4. Left? ___ 8. Word problem: 33 marbles, lose 5. How many left? ___

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More written practice

1. 36 − 4 = ___ 2. Fill in: 6 + ___ = 11 3. Story: 4 apples and 4 more. Total? ___ 4. Story: 8 stickers, give away 4. Left? ___ 5. 3 + 4 = ___ 6. 7 − 4 = ___

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Patterns and rules

1. 6 + 6 = ___ 2. 12 − 6 = ___ 3. 50 − 6 = ___

_See printable PDF for diagram._

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Stretch

1. Two-step: Start with 9, add 3, then subtract 1. Result? ___ 2. Explain your thinking for this word problem in one sentence.

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Parent tip: Draw number bonds or number lines