✏️ Missing Numbers: Practice A (1.OA.D.8)

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Determine the unknown whole number in an addition or subtraction equation. Solve each problem.

1. 6 + ___ = 8

2. ___ − 7 = 10

3. 7 − ___ = 4

4. 4 + ___ = 5

5. ___ − 10 = 10

6. 14 − ___ = 7

7. 2 + ___ = 7

8. ___ − 7 = 1

9. 15 − ___ = 7

10. 10 + ___ = 14

11. ___ − 9 = 10

12. 4 − ___ = 1

Answer key: 1) 2 · 2) 17 · 3) 3 · 4) 1 · 5) 20 · 6) 7 · 7) 5 · 8) 8 · 9) 8 · 10) 4 · 11) 19 · 12) 3

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Worksheets › Grade 1 Math › Missing Numbers › Missing Numbers

Grade 1 (ages 6–7)Numbers & mathsFree printable PDF

About this grade 1 worksheet

Free Grade 1 math worksheet (Common Core 1.OA.D.8): missing numbers — twelve practice problems, with answer key. Skill: Determine the unknown whole number in an addition or subtraction equation. Level: Grade 1 — also suits Year 2 (UK).

For teachers: skills & standards

CCSS 1.OA.D.8: Find the unknown number in an addition or subtraction equation
Works as a morning-work page, a centre/station activity, homework or an early-finisher task.

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What age is it for?

It is designed for Grade 1 (ages 6–7), but use it with any child who is ready.

What skills does it build?

Determine the unknown whole number in an addition or subtraction equation.

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More “Missing Numbers” printables (1.oa.d.8: determine the unknown whole number in an addition or subtraction equation)

Missing Numbers: Practice B (1.OA.D.8) · Missing Numbers: Mixed Practice & Reasoning (1.OA.D.8) · Missing Numbers: Show Your Thinking (1.OA.D.8) · Missing Numbers: Quick Check (1.OA.D.8)

All 5 missing numbers sheets → · Grade 1 Math: all 10 skills → · All Common Core grades

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