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Equivalent Fractions — Missing Denominator is a free printable Grade 4 maths worksheet on the unknown on the bottom, aligned to Common Core standard 4.NF.A.1. 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 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.

Equivalent Fractions — Missing Denominator

4.NF.A.1

NameDate

Fill in the missing number.

1.1/2 = 2/___
2.5/6 = 10/___
3.3/4 = 9/___
4.1/6 = 2/___
5.3/4 = 12/___
6.4/5 = 8/___
7.6/8 = 18/___
8.1/5 = 5/___
9.1/5 = 4/___
10.4/5 = 12/___
11.1/3 = 3/___
12.1/4 = 2/___

LessonPrint · 4.NF.A.1 · Set 10 · free to copy for classroom use

Answer key — Equivalent Fractions — Missing Denominator

Set 10. Prints on its own sheet.

  1. 1.4
  2. 2.12
  3. 3.12
  4. 4.12
  5. 5.16
  6. 6.10
  7. 7.24
  8. 8.25
  9. 9.20
  10. 10.15
  11. 11.9
  12. 12.8

Last reviewed 2026-09-05. Aligned to 4.NF.A.1 of the Common Core State Standards for mathematics.