Practice Problems — Set 9

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. 3 × 3 = ___ 2. 9 ÷ 3 = ___ 3. Draw an array for 3 rows of 5. Total? ___ 4. Groups: 4 bags with 6 each. Total? ___ 5. Share 30 equally among 4 friends. Each gets ___ 6. Missing factor: ___ × 4 = 12 7. Apply Understand division as an unknown-factor problem (item 7, set 9): show your work. ___ 8. Apply Understand division as an unknown-factor problem (item 8, set 9): show your work. ___

___________________________ ___________________________ ___________________________ ___________________________

More written practice

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

___________________________ ___________________________ ___________________________ ___________________________ ___________________________

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._

___________________________ ___________________________ ___________________________ ___________________________

Parent tip: Draw arrays for multiplication