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Doubles to 20 is a free printable Grade 1 maths worksheet on the doubles facts, aligned to Common Core standard 1.OA.C.6. It prints 6 questions with an answer key on its own sheet of paper, in 25 versions, 23 of them with 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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One paper per pupil

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23 of these 25 sets ask different questions — this skill does not have 25 questions to give. The rest reorder them, so no two pupils have the same paper in front of them.

Doubles to 20

1.OA.C.6

NameDate

Work out each answer.

1.1 + 1 =
2.2 + 2 =
3.3 + 3 =
4.5 + 5 =
5.4 + 4 =
6.9 + 9 =

LessonPrint · 1.OA.C.6 · Set 1 · free to copy for classroom use

Answer key — Doubles to 20

Set 1. Prints on its own sheet.

  1. 1.2
  2. 2.4
  3. 3.6
  4. 4.10
  5. 5.8
  6. 6.18

Questions about Doubles to 20

What does the Doubles to 20 worksheet cover?

It practises the doubles facts — 6 questions for Grade 1, all on Common Core 1.OA.C.6: Add and subtract within 20, quickly and accurately within 10. The instruction to pupils is “Work out each answer”, and the answer key follows on the next sheet.

Which Common Core standard does Doubles to 20 practise?

CCSS.MATH.CONTENT.1.OA.C.6 — 1.OA.C.6, in the Operations & Algebraic Thinking domain for Grade 1. The published standard reads: “Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Doubles to 20 is written for Grade 1, typically ages 6-7. It is one of the sheets on 1.OA.C.6, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Doubles to 20 come with an answer key?

Yes. All 6 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 Doubles to 20 can I print?

25 versions, of which 23 ask genuinely different questions — this skill does not have 25 distinct questions to give, so the rest reorder them and no two pupils still share a paper. Set 1 downloads all 25 as one PDF.

Is Doubles to 20 free to print and photocopy?

Yes. Doubles to 20, 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.C.6

Add and subtract within 20, quickly and accurately within 10.

All Grade 1 worksheets

Last reviewed 2026-09-05. Aligned to 1.OA.C.6 of the Common Core State Standards for mathematics.