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Find the Rule from the Numbers is a free printable Grade 5 maths worksheet on inferring a rule from the terms alone, aligned to Common Core standard 5.OA.B.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 20 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 from the Numbers

5.OA.B.3

NameDate

Write the rule and the next number.

1.9, 27, 45, 63, 81, ___ What is the rule?
2.8, 28, 48, 68, 88, ___ What is the rule?
3.3, 27, 51, 75, 99, ___ What is the rule?
4.6, 21, 36, 51, 66, ___ What is the rule?
5.6, 23, 40, 57, 74, ___ What is the rule?
6.1, 17, 33, 49, 65, ___ What is the rule?
7.5, 24, 43, 62, 81, ___ What is the rule?
8.9, 29, 49, 69, 89, ___ What is the rule?

LessonPrint · 5.OA.B.3 · Set 20 · free to copy for classroom use

Answer key — Find the Rule from the Numbers

Set 20. Prints on its own sheet.

  1. 1.add 18; next is 99
  2. 2.add 20; next is 108
  3. 3.add 24; next is 123
  4. 4.add 15; next is 81
  5. 5.add 17; next is 91
  6. 6.add 16; next is 81
  7. 7.add 19; next is 100
  8. 8.add 20; next is 109

Last reviewed 2026-09-05. Aligned to 5.OA.B.3 of the Common Core State Standards for mathematics.