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Patterns — Adding is a free printable Grade 3 maths worksheet on spotting a constant added step, aligned to Common Core standard 3.OA.D.9. 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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One paper per pupil

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All 25 sets ask different questions.

Patterns — Adding

3.OA.D.9

NameDate

Write the missing numbers.

1.17213337
2.481224
3.20243240
4.20283240
5.19273539
6.7192327
7.3111923
8.18223038

LessonPrint · 3.OA.D.9 · Set 1 · free to copy for classroom use

Answer key — Patterns — Adding

Set 1. Prints on its own sheet.

  1. 1.25, 29
  2. 2.16, 20
  3. 3.28, 36
  4. 4.24, 36
  5. 5.23, 31
  6. 6.11, 15
  7. 7.7, 15
  8. 8.26, 34

Questions about Patterns — Adding

What does the Patterns — Adding worksheet cover?

It practises spotting a constant added step — 8 questions for Grade 3, all on Common Core 3.OA.D.9: Spot and explain number patterns. The instruction to pupils is “Write the missing numbers”, and the answer key follows on the next sheet.

Which Common Core standard does Patterns — Adding practise?

CCSS.MATH.CONTENT.3.OA.D.9 — 3.OA.D.9, in the Operations & Algebraic Thinking domain for Grade 3. The published standard reads: “Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Patterns — Adding is written for Grade 3, typically ages 8-9. It is one of the sheets on 3.OA.D.9, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Patterns — Adding 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 Patterns — Adding 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 Patterns — Adding free to print and photocopy?

Yes. Patterns — Adding, 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.

Is there a lesson plan to teach 3.OA.D.9?

Yes — “Finding and Explaining Patterns” is a 45-minute Grade 3 plan for 3.OA.D.9, timed section by section, with the misconceptions to expect and an exit ticket. Patterns — Adding is the practice that follows it.

More practice for 3.OA.D.9

Spot and explain number patterns.

Teaching this next? Finding and Explaining Patterns is the 45-minute plan for it, with the misconceptions to expect.

All Grade 3 worksheets

Last reviewed 2026-09-05. Aligned to 3.OA.D.9 of the Common Core State Standards for mathematics.