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Round then Estimate is a free printable Grade 3 math worksheet on using rounding to check an answer, aligned to Common Core standard 3.NBT.A.1. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions that each ask 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.

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All 25 sets ask different questions.

Round then Estimate

3.NBT.A.1

NameDate

Estimate first, then work it out.

1.Estimate 119 + 667 by rounding each number to the nearest ten, then work it out.
2.Estimate 397 + 284 by rounding each number to the nearest ten, then work it out.
3.Estimate 524 + 492 by rounding each number to the nearest ten, then work it out.
4.Estimate 181 + 535 by rounding each number to the nearest ten, then work it out.
5.Estimate 253 + 127 by rounding each number to the nearest ten, then work it out.
6.Estimate 180 + 199 by rounding each number to the nearest ten, then work it out.
7.Estimate 367 + 729 by rounding each number to the nearest ten, then work it out.
8.Estimate 856 + 807 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 1 · free to copy for classroom use

Answer key — Round then Estimate

Set 1. Prints on its own sheet.

  1. 1.about 790; exactly 786
  2. 2.about 680; exactly 681
  3. 3.about 1010; exactly 1016
  4. 4.about 720; exactly 716
  5. 5.about 380; exactly 380
  6. 6.about 380; exactly 379
  7. 7.about 1100; exactly 1096
  8. 8.about 1670; exactly 1663

Questions about Round then Estimate

What does the Round then Estimate worksheet cover?

It practices using rounding to check an answer — 8 questions for Grade 3, all on Common Core 3.NBT.A.1: Round numbers to the nearest ten or hundred. The instruction to students is “Estimate first, then work it out”, and the answer key follows on the next sheet.

Which Common Core standard does Round then Estimate practice?

CCSS.MATH.CONTENT.3.NBT.A.1 — 3.NBT.A.1, under Number & Operations in Base Ten 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.

What age or grade is this worksheet for?

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 student working at that standard — including older students revisiting it and younger ones working ahead.

Does Round then Estimate come with an answer key?

Yes. All 8 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 Round then Estimate can I print?

25 — one per student, 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 Round then Estimate free to print and photocopy?

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.

More practice for 3.NBT.A.1

Round numbers to the nearest ten or hundred.

All Grade 3 worksheets

Last reviewed 2026-09-05. Aligned to 3.NBT.A.1 of the Common Core State Standards for Mathematics.