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Add Within 5 — Missing Number is a free printable Kindergarten maths worksheet on the unknown moved out of the answer position, aligned to Common Core standard K.OA.A.5. It prints 12 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.

Add Within 5 — Missing Number

K.OA.A.5

NameDate

Work out each answer.

1.___ + 5 = 5
2.___ + 3 = 6
3.___ + 2 = 3
4.___ + 4 = 8
5.___ + 1 = 3
6.___ + 4 = 9
7.___ + 3 = 4
8.___ + 4 = 6
9.___ + 5 = 7
10.___ + 0 = 2
11.___ + 2 = 2
12.___ + 5 = 9

LessonPrint · K.OA.A.5 · Set 1 · free to copy for classroom use

Answer key — Add Within 5 — Missing Number

Set 1. Prints on its own sheet.

  1. 1.0
  2. 2.3
  3. 3.1
  4. 4.4
  5. 5.2
  6. 6.5
  7. 7.1
  8. 8.2
  9. 9.2
  10. 10.2
  11. 11.0
  12. 12.4

Questions about Add Within 5 — Missing Number

What does the Add Within 5 — Missing Number worksheet cover?

It practises the unknown moved out of the answer position — 12 questions for Kindergarten, all on Common Core K.OA.A.5: Add and subtract small numbers quickly, without counting every time. The instruction to pupils is “Work out each answer”, and the answer key follows on the next sheet.

Which Common Core standard does Add Within 5 — Missing Number practise?

CCSS.MATH.CONTENT.K.OA.A.5 — K.OA.A.5, in the Operations & Algebraic Thinking domain for Kindergarten. The published standard reads: “Fluently add and subtract within 5.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

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

Does Add Within 5 — Missing Number come with an answer key?

Yes. All 12 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 Add Within 5 — Missing Number 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 Add Within 5 — Missing Number free to print and photocopy?

Yes. Add Within 5 — Missing Number, 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.5

Add and subtract small numbers quickly, without counting every time.

All Kindergarten worksheets

Last reviewed 2026-09-05. Aligned to K.OA.A.5 of the Common Core State Standards for mathematics.