🧮 Missing Addend

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Name:

Date:

Find the missing number.

1.5 + ___ = 8

2.10 + ___ = 16

3.9 + ___ = 15

4.8 + ___ = 18

5.5 + ___ = 9

6.8 + ___ = 15

7.1 + ___ = 16

8.7 + ___ = 17

9.4 + ___ = 19

10.2 + ___ = 16

11.2 + ___ = 8

12.3 + ___ = 17

13.2 + ___ = 5

14.1 + ___ = 10

15.7 + ___ = 20

16.3 + ___ = 6

17.1 + ___ = 19

18.5 + ___ = 20

19.10 + ___ = 15

20.9 + ___ = 20

Answer key: 1. 3 · 2. 6 · 3. 6 · 4. 10 · 5. 4 · 6. 7 · 7. 15 · 8. 10 · 9. 15 · 10. 14 · 11. 6 · 12. 14 · 13. 3 · 14. 9 · 15. 13 · 16. 3 · 17. 18 · 18. 15 · 19. 5 · 20. 11

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Worksheets › Grade 1 › Numbers & maths

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

About this grade 1 worksheet

Free 1st grade worksheet: find the missing number in addition sentences like 7 + __ = 12. Answer key included. Skill: Finding the unknown number. 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.

Frequently asked questions

Is this worksheet free?

Yes — it is free to print for home or the classroom. Sign in with a free Pagine account, then use the Print button or save it as a PDF.

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?

Finding the unknown number.

Where can I find grade 1 books to read with it?

Pagine's free library has 20,000+ children's books you can read in the Pagine e-reader or the free Pagine app — sorted by age and grade, with free audiobooks too.

More numbers & maths worksheets

Number Tracing 0–10 · Number 1 Worksheet: Trace, Count & Colour · Number 2 Worksheet: Trace, Count & Colour · Number 3 Worksheet: Trace, Count & Colour · Number 4 Worksheet: Trace, Count & Colour · Number 5 Worksheet: Trace, Count & Colour · Number 6 Worksheet: Trace, Count & Colour · Number 7 Worksheet: Trace, Count & Colour · Number 8 Worksheet: Trace, Count & Colour · Number 9 Worksheet: Trace, Count & Colour

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