Practice Problems — Set 20

1.OA.B.4 · Understand subtraction as an unknown-addend problem

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

Warm-up

1. Talk through today's focus: Understand subtraction as an unknown-addend problem 2. Try one oral example together before writing. 3. Use the diagram to explain your thinking.

_See printable PDF for diagram._

Written practice

1. 3 + 6 = ___ 2. 9 − 6 = ___ 3. 35 − 3 = ___ 4. Fill in: 8 + ___ = 10 5. Story: 3 apples and 6 more. Total? ___ 6. Story: 9 stickers, give away 6. Left? ___ 7. Explain your thinking for set 20 in one sentence. 8. Create your own problem for 1.OA.B.4.

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More written practice

1. Apply Understand subtraction as an unknown-addend problem (item 9, set 20): show your work. ___ 2. Apply Understand subtraction as an unknown-addend problem (item 10, set 20): show your work. ___ 3. Apply Understand subtraction as an unknown-addend problem (item 11, set 20): show your work. ___ 4. Apply Understand subtraction as an unknown-addend problem (item 12, set 20): show your work. ___ 5. Apply Understand subtraction as an unknown-addend problem (item 13, set 20): show your work. ___ 6. Apply Understand subtraction as an unknown-addend problem (item 14, set 20): show your work. ___

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Patterns and rules

1. Identify the rule in today's 1.OA.B.4 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.B.4 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