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Break Apart 10 is a free printable Kindergarten maths worksheet on decomposing ten as a fact and its turnaround, aligned to Common Core standard K.OA.A.3. It prints 9 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.

Break Apart 10

K.OA.A.3

NameDate

Fill in both blanks.

1.2 + 3 = ___ , so 3 + 2 = ___
2.3 + 3 = ___ , so 3 + 3 = ___
3.5 + 3 = ___ , so 3 + 5 = ___
4.1 + 3 = ___ , so 3 + 1 = ___
5.1 + 1 = ___ , so 1 + 1 = ___
6.1 + 4 = ___ , so 4 + 1 = ___
7.3 + 5 = ___ , so 5 + 3 = ___
8.3 + 4 = ___ , so 4 + 3 = ___
9.5 + 2 = ___ , so 2 + 5 = ___

LessonPrint · K.OA.A.3 · Set 1 · free to copy for classroom use

Answer key — Break Apart 10

Set 1. Prints on its own sheet.

  1. 1.5 and 5
  2. 2.6 and 6
  3. 3.8 and 8
  4. 4.4 and 4
  5. 5.2 and 2
  6. 6.5 and 5
  7. 7.8 and 8
  8. 8.7 and 7
  9. 9.7 and 7

Questions about Break Apart 10

What does the Break Apart 10 worksheet cover?

It practises decomposing ten as a fact and its turnaround — 9 questions for Kindergarten, all on Common Core K.OA.A.3: Break numbers up to 10 into two parts in different ways. The instruction to pupils is “Fill in both blanks”, and the answer key follows on the next sheet.

Which Common Core standard does Break Apart 10 practise?

CCSS.MATH.CONTENT.K.OA.A.3 — K.OA.A.3, in the Operations & Algebraic Thinking domain for Kindergarten. The published standard reads: “Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Break Apart 10 is written for Kindergarten, typically ages 5-6. It is one of the sheets on K.OA.A.3, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Break Apart 10 come with an answer key?

Yes. All 9 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 Break Apart 10 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 Break Apart 10 free to print and photocopy?

Yes. Break Apart 10, 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 K.OA.A.3

Break numbers up to 10 into two parts in different ways.

All Kindergarten worksheets

Last reviewed 2026-09-05. Aligned to K.OA.A.3 of the Common Core State Standards for mathematics.