Equivalent Fractions — Missing Numerator is a free printable Grade 4 maths worksheet on the unknown on the top, 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.
4.NF.A.1
Fill in the missing number.
LessonPrint · 4.NF.A.1 · Set 1 · free to copy for classroom use
Set 1. Prints on its own sheet.
It practises the unknown on the top — 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.
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.
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 pupil working at that standard — including older pupils revisiting it and younger ones working ahead.
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.
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.
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.
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.
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.