Round then Estimate is a free printable Grade 3 maths worksheet on using rounding to check an answer, aligned to Common Core standard 3.NBT.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 1 of 25 · the same problems every time you open this link.
Next set3.NBT.A.1
Round each number.
LessonPrint · 3.NBT.A.1 · Set 1 · free to copy for classroom use
Set 1. Prints on its own sheet.
It practises using rounding to check an answer — 12 questions for Grade 3, all on Common Core 3.NBT.A.1: Round numbers to the nearest ten or hundred. The instruction to pupils is “Round each number”, and the answer key follows on the next sheet.
CCSS.MATH.CONTENT.3.NBT.A.1 — 3.NBT.A.1, in the Number & Operations in Base Ten domain for Grade 3. The published standard reads: “Use place value understanding to round whole numbers to the nearest 10 or 100.” The worksheet assesses that standard rather than a paraphrase of it.
Round then Estimate is written for Grade 3, typically ages 8-9. It is one of the sheets on 3.NBT.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. Round then Estimate, 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.
Round numbers to the nearest ten or hundred.
Last reviewed 2026-09-05. Aligned to 3.NBT.A.1 of the Common Core State Standards for mathematics.