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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.

Set 19 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Round then Estimate

3.NBT.A.1

NameDate

Estimate first, then work it out.

1.Estimate 329 + 393 by rounding each number to the nearest ten, then work it out.
2.Estimate 193 + 637 by rounding each number to the nearest ten, then work it out.
3.Estimate 673 + 413 by rounding each number to the nearest ten, then work it out.
4.Estimate 220 + 194 by rounding each number to the nearest ten, then work it out.
5.Estimate 357 + 337 by rounding each number to the nearest ten, then work it out.
6.Estimate 829 + 455 by rounding each number to the nearest ten, then work it out.
7.Estimate 828 + 538 by rounding each number to the nearest ten, then work it out.
8.Estimate 666 + 303 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 19 · free to copy for classroom use

Answer key — Round then Estimate

Set 19. Prints on its own sheet.

  1. 1.about 720; exactly 722
  2. 2.about 830; exactly 830
  3. 3.about 1080; exactly 1086
  4. 4.about 410; exactly 414
  5. 5.about 700; exactly 694
  6. 6.about 1290; exactly 1284
  7. 7.about 1370; exactly 1366
  8. 8.about 970; exactly 969

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