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🧠 Unknown Factors: Show Your Thinking (3.OA.A.4)

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Determine the unknown number in a multiplication or division equation. Solve each problem and show your work.

1. 5 × ___ = 45
Show your work
2. ___ ÷ 7 = 6
Show your work
3. 16 ÷ ___ = 2
Show your work
4. 8 × ___ = 24
Show your work
5. ___ ÷ 3 = 6
Show your work
6. 70 ÷ ___ = 10
Show your work

Explain: How did you solve problem 1? Could you check it another way?

Answer key: 1) 9 · 2) 42 · 3) 8 · 4) 3 · 5) 18 · 6) 7
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Worksheets › Grade 3 Math › Unknown Factors › Unknown Factors

Grade 3 (ages 8–9)Numbers & mathsFree printable PDF

About this grade 3 worksheet

Free Grade 3 math worksheet (Common Core 3.OA.A.4): unknown factors — problems with space to show work and explain reasoning, with answer key. Skill: Determine the unknown number in a multiplication or division equation. Level: Grade 3 — also suits Year 4 (UK).

For teachers: skills & standards

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What age is it for?

It is designed for Grade 3 (ages 8–9), but use it with any child who is ready.

What skills does it build?

Determine the unknown number in a multiplication or division equation.

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More “Unknown Factors” printables (3.oa.a.4: determine the unknown number in a multiplication or division equation)

Unknown Factors: Practice A (3.OA.A.4) · Unknown Factors: Practice B (3.OA.A.4) · Unknown Factors: Mixed Practice & Reasoning (3.OA.A.4) · Unknown Factors: Quick Check (3.OA.A.4)

All 5 unknown factors sheets → · Grade 3 Math: all 10 skills → · All Common Core grades

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