Practice Problems — Set 3
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 + 4 = ___ 2. 10 − 4 = ___ 3. 18 − 6 = ___ 4. Fill in: 6 + ___ = 13 5. Story: 6 apples and 4 more. Total? ___ 6. Story: 10 stickers, give away 4. Left? ___ 7. Apply Determine the unknown whole number in an addition or subtraction equa… (item 7, set 3): show your work. ___ 8. Apply Determine the unknown whole number in an addition or subtraction equa… (item 8, set 3): show your work. ___
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More written practice
1. Apply Determine the unknown whole number in an addition or subtraction equa… (item 9, set 3): show your work. ___ 2. Apply Determine the unknown whole number in an addition or subtraction equa… (item 10, set 3): show your work. ___ 3. Apply Determine the unknown whole number in an addition or subtraction equa… (item 11, set 3): show your work. ___ 4. Apply Determine the unknown whole number in an addition or subtraction equa… (item 12, set 3): show your work. ___ 5. Apply Determine the unknown whole number in an addition or subtraction equa… (item 13, set 3): show your work. ___ 6. Apply Determine the unknown whole number in an addition or subtraction equa… (item 14, set 3): 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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Parent tip: Draw number bonds or number lines