Equivalent Fractions — Missing Numerator
4.NF.A.1
NameDate
Fill in the missing number.
1.1/2 = ___/8
2.2/3 = ___/12
3.1/2 = ___/6
4.3/4 = ___/12
LessonPrint · 4.NF.A.1 · Set 1 · free to copy for classroom use
Equivalent Fractions — Missing Numerator is a free printable Grade 4 math worksheet on the unknown on the top, scaled by three, four or five, aligned to Common Core standard 4.NF.A.1. It prints 4 questions with an answer key on its own sheet of paper, in 25 versions, 19 of them with different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
Answer key — Equivalent Fractions — Missing Numerator
Set 1. Prints on its own sheet.
- 1.4
- 2.8
- 3.3
- 4.9
Questions about Equivalent Fractions — Missing Numerator
What does the Equivalent Fractions — Missing Numerator worksheet cover?
It practices the unknown on the top, scaled by three, four or five — 4 questions for Grade 4, all on Common Core 4.NF.A.1: Understand why equivalent fractions are equal. The instruction to students is “Fill in the missing number”, and the answer key follows on the next sheet.
Which Common Core standard does Equivalent Fractions — Missing Numerator practice?
CCSS.MATH.CONTENT.4.NF.A.1 — 4.NF.A.1, under Number & Operations — Fractions 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 Numerator is written for Grade 4, typically ages 9-10. It is one of the sheets on 4.NF.A.1, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.
Does Equivalent Fractions — Missing Numerator come with an answer key?
Yes. All 4 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 Numerator can I print?
25 versions, of which 19 ask genuinely different questions — this skill does not have 25 distinct questions to give, so the rest reorder them and no two students still share a paper. Set 1 downloads all 25 as one PDF.
Is Equivalent Fractions — Missing Numerator free to print and photocopy?
Yes. Equivalent Fractions — Missing Numerator, 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 4.NF.A.1?
Yes — “Why Equivalent Fractions Are Equal” is a 45-minute Grade 4 plan for 4.NF.A.1, timed section by section, with the misconceptions to expect and an exit ticket. Equivalent Fractions — Missing Numerator is the practice that follows it.
More practice for 4.NF.A.1
Understand why equivalent fractions are equal.
Teaching this next? Why Equivalent Fractions Are Equal is the 45-minute plan for it, with the misconceptions to expect.
Last reviewed 2026-09-05. Aligned to 4.NF.A.1 of the Common Core State Standards for Mathematics.