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Practice Problems — Set 2

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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. 5 + 6 = ___ 2. 11 − 6 = ___ 3. 17 − 5 = ___ 4. Fill in: 8 + ___ = 12 5. Story: 5 apples and 6 more. Total? ___ 6. Story: 11 stickers, give away 6. Left? ___ 7. Apply Determine the unknown whole number in an addition or subtraction equa… (item 7, set 2): show your work. ___ 8. Apply Determine the unknown whole number in an addition or subtraction equa… (item 8, set 2): show your work. ___

___________________________ ___________________________ ___________________________ ___________________________

More written practice

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

___________________________ ___________________________ ___________________________ ___________________________ ___________________________

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._

___________________________ ___________________________ ___________________________ ___________________________

Parent tip: Draw number bonds or number lines

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