Practice Problems — Set 15

3.OA.B.6 · Understand division as an unknown-factor problem

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

Warm-up

1. Talk through today's focus: Understand division as an unknown-factor 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. 5 × 3 = ___ 2. 15 ÷ 3 = ___ 3. Draw an array for 3 rows of 5. Total? ___ 4. Groups: 4 bags with 6 each. Total? ___ 5. Share 42 equally among 4 friends. Each gets ___ 6. Missing factor: ___ × 4 = 20 7. Explain your thinking for set 15 in one sentence. 8. Create your own problem for 3.OA.B.6.

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More written practice

1. Apply Understand division as an unknown-factor problem (item 9, set 15): show your work. ___ 2. Apply Understand division as an unknown-factor problem (item 10, set 15): show your work. ___ 3. Apply Understand division as an unknown-factor problem (item 11, set 15): show your work. ___ 4. Apply Understand division as an unknown-factor problem (item 12, set 15): show your work. ___ 5. Apply Understand division as an unknown-factor problem (item 13, set 15): show your work. ___ 6. Apply Understand division as an unknown-factor problem (item 14, set 15): show your work. ___

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Patterns and rules

1. Multiplication counts equal groups. 2. Division can mean sharing or forming equal groups. 3. Arrays show rows × columns.

_See printable PDF for diagram._

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Parent tip: Draw arrays for multiplication