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Find the Rule is a free printable Grade 3 maths worksheet on naming a small additive rule, not just continuing it, 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 10 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Find the Rule

3.OA.D.9

NameDate

Write the rule and the next number.

1.6, 9, 12, 15, 18, ___ What is the rule?
2.4, 6, 8, 10, 12, ___ What is the rule?
3.5, 7, 9, 11, 13, ___ What is the rule?
4.3, 6, 9, 12, 15, ___ What is the rule?
5.2, 4, 6, 8, 10, ___ What is the rule?
6.6, 8, 10, 12, 14, ___ What is the rule?
7.7, 9, 11, 13, 15, ___ What is the rule?
8.9, 11, 13, 15, 17, ___ What is the rule?

LessonPrint · 3.OA.D.9 · Set 10 · free to copy for classroom use

Answer key — Find the Rule

Set 10. Prints on its own sheet.

  1. 1.add 3; next is 21
  2. 2.add 2; next is 14
  3. 3.add 2; next is 15
  4. 4.add 3; next is 18
  5. 5.add 2; next is 12
  6. 6.add 2; next is 16
  7. 7.add 2; next is 17
  8. 8.add 2; next is 19

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