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Practice Problems — Set 19

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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. Talk through today's focus: Determine the unknown whole number in an addition or subtraction equa… 2. Try one oral example together before writing. 3. Use the diagram to explain your thinking.

_See printable PDF for diagram._

Written practice

1. 6 + 5 = ___ 2. 11 − 5 = ___ 3. 34 − 6 = ___ 4. Fill in: 7 + ___ = 14 5. Story: 6 apples and 5 more. Total? ___ 6. Story: 11 stickers, give away 5. Left? ___ 7. Explain your thinking for set 19 in one sentence. 8. Create your own problem for 1.OA.D.8.

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More written practice

1. Apply Determine the unknown whole number in an addition or subtraction equa… (item 9, set 19): show your work. ___ 2. Apply Determine the unknown whole number in an addition or subtraction equa… (item 10, set 19): show your work. ___ 3. Apply Determine the unknown whole number in an addition or subtraction equa… (item 11, set 19): show your work. ___ 4. Apply Determine the unknown whole number in an addition or subtraction equa… (item 12, set 19): show your work. ___ 5. Apply Determine the unknown whole number in an addition or subtraction equa… (item 13, set 19): show your work. ___ 6. Apply Determine the unknown whole number in an addition or subtraction equa… (item 14, set 19): show your work. ___

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Patterns and rules

1. Identify the rule in today's 1.OA.D.8 practice. 2. Show your work with a drawing or diagram. 3. Explain your answer to a parent.

_See printable PDF for diagram._

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Stretch

1. Create your own 1.OA.D.8 question for a parent to solve. 2. Explain your method in two sentences.

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Parent tip: Draw number bonds or number lines

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