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Think Addition to Subtract is a free printable Grade 1 maths worksheet on solving a subtraction by asking what to add, aligned to Common Core standard 1.OA.B.4. It prints 16 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 1 of 25 · the same problems every time you open this link.

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All 25 sets ask different questions.

Think Addition to Subtract

1.OA.B.4

NameDate

Work out each answer.

1.20 − ___ = 17
2.14 − ___ = 9
3.12 − ___ = 3
4.14 − ___ = 10
5.10 − ___ = 8
6.15 − ___ = 10
7.10 − ___ = 4
8.11 − ___ = 6
9.18 − ___ = 12
10.12 − ___ = 4
11.14 − ___ = 7
12.10 − ___ = 6
13.10 − ___ = 1
14.14 − ___ = 13
15.15 − ___ = 6
16.12 − ___ = 9

LessonPrint · 1.OA.B.4 · Set 1 · free to copy for classroom use

Answer key — Think Addition to Subtract

Set 1. Prints on its own sheet.

  1. 1.3
  2. 2.5
  3. 3.9
  4. 4.4
  5. 5.2
  6. 6.5
  7. 7.6
  8. 8.5
  9. 9.6
  10. 10.8
  11. 11.7
  12. 12.4
  13. 13.9
  14. 14.1
  15. 15.9
  16. 16.3

Questions about Think Addition to Subtract

What does the Think Addition to Subtract worksheet cover?

It practises solving a subtraction by asking what to add — 16 questions for Grade 1, all on Common Core 1.OA.B.4: See subtraction as finding the missing part. The instruction to pupils is “Work out each answer”, and the answer key follows on the next sheet.

Which Common Core standard does Think Addition to Subtract practise?

CCSS.MATH.CONTENT.1.OA.B.4 — 1.OA.B.4, in the Operations & Algebraic Thinking domain for Grade 1. The published standard reads: “Understand subtraction as an unknown-addend problem.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Think Addition to Subtract is written for Grade 1, typically ages 6-7. It is one of the sheets on 1.OA.B.4, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Think Addition to Subtract come with an answer key?

Yes. All 16 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.

How many different versions of Think Addition to Subtract can I print?

25 — one per pupil, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.

Is Think Addition to Subtract free to print and photocopy?

Yes. Think Addition to Subtract, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.

More practice for 1.OA.B.4

See subtraction as finding the missing part.

All Grade 1 worksheets

Last reviewed 2026-09-05. Aligned to 1.OA.B.4 of the Common Core State Standards for mathematics.