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Count by Twos is a free printable Grade 2 maths worksheet on the even sequence, aligned to Common Core standard 2.OA.C.3. It prints 8 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.

Count by Twos

2.OA.C.3

NameDate

Write the missing numbers.

1.17111315
2.19111315
3.3791517
4.1822242632
5.1117192125
6.2729353741
7.2127313335
8.2632343840

LessonPrint · 2.OA.C.3 · Set 1 · free to copy for classroom use

Answer key — Count by Twos

Set 1. Prints on its own sheet.

  1. 1.3, 5, 9
  2. 2.3, 5, 7
  3. 3.5, 11, 13
  4. 4.20, 28, 30
  5. 5.13, 15, 23
  6. 6.31, 33, 39
  7. 7.23, 25, 29
  8. 8.28, 30, 36

Questions about Count by Twos

What does the Count by Twos worksheet cover?

It practises the even sequence — 8 questions for Grade 2, all on Common Core 2.OA.C.3: Tell whether a number is odd or even. The instruction to pupils is “Write the missing numbers”, and the answer key follows on the next sheet.

Which Common Core standard does Count by Twos practise?

CCSS.MATH.CONTENT.2.OA.C.3 — 2.OA.C.3, in the Operations & Algebraic Thinking domain for Grade 2. The published standard reads: “Determine whether a group of objects (up to 20) has an odd or even number of members.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Count by Twos is written for Grade 2, typically ages 7-8. It is one of the sheets on 2.OA.C.3, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Count by Twos come with an answer key?

Yes. All 8 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 Count by Twos 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 Count by Twos free to print and photocopy?

Yes. Count by Twos, 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 2.OA.C.3

Tell whether a number is odd or even.

All Grade 2 worksheets

Last reviewed 2026-09-05. Aligned to 2.OA.C.3 of the Common Core State Standards for mathematics.