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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.

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All 25 sets ask different questions.

Equivalent Fractions — Missing Denominator

4.NF.A.1

NameDate

Fill in the missing number.

1.1/8 = 3/___
2.1/3 = 2/___
3.2/7 = 4/___
4.1/4 = 2/___
5.7/8 = 35/___
6.5/7 = 15/___
7.3/6 = 6/___
8.2/3 = 8/___
9.1/3 = 5/___
10.3/6 = 15/___
11.3/4 = 6/___
12.2/8 = 6/___

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

Answer key — Equivalent Fractions — Missing Denominator

Set 1. Prints on its own sheet.

  1. 1.24
  2. 2.6
  3. 3.14
  4. 4.8
  5. 5.40
  6. 6.21
  7. 7.12
  8. 8.12
  9. 9.15
  10. 10.30
  11. 11.8
  12. 12.24

Questions about Equivalent Fractions — Missing Denominator

What does the Equivalent Fractions — Missing Denominator worksheet cover?

It practises the unknown on the bottom — 12 questions for Grade 4, all on Common Core 4.NF.A.1: Understand why equivalent fractions are equal. The instruction to pupils is “Fill in the missing number”, and the answer key follows on the next sheet.

Which Common Core standard does Equivalent Fractions — Missing Denominator practise?

CCSS.MATH.CONTENT.4.NF.A.1 — 4.NF.A.1, in the Number & Operations — Fractions domain for Grade 4. The published standard reads: “Explain why a fraction a/b is equivalent to a fraction (n × a)/(n × b) by using visual fraction models.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Equivalent Fractions — Missing Denominator is written for Grade 4, typically ages 9-10. It is one of the sheets on 4.NF.A.1, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Equivalent Fractions — Missing Denominator come with an answer key?

Yes. All 12 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 Equivalent Fractions — Missing Denominator 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 Equivalent Fractions — Missing Denominator free to print and photocopy?

Yes. Equivalent Fractions — Missing Denominator, 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 4.NF.A.1

Understand why equivalent fractions are equal.

All Grade 4 worksheets

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