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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 8 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 281 + 336 by rounding each number to the nearest ten, then work it out.
2.Estimate 220 + 608 by rounding each number to the nearest ten, then work it out.
3.Estimate 864 + 396 by rounding each number to the nearest ten, then work it out.
4.Estimate 704 + 202 by rounding each number to the nearest ten, then work it out.
5.Estimate 821 + 288 by rounding each number to the nearest ten, then work it out.
6.Estimate 851 + 305 by rounding each number to the nearest ten, then work it out.
7.Estimate 772 + 264 by rounding each number to the nearest ten, then work it out.
8.Estimate 819 + 218 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 8 · free to copy for classroom use

Answer key — Round then Estimate

Set 8. Prints on its own sheet.

  1. 1.about 620; exactly 617
  2. 2.about 830; exactly 828
  3. 3.about 1260; exactly 1260
  4. 4.about 900; exactly 906
  5. 5.about 1110; exactly 1109
  6. 6.about 1160; exactly 1156
  7. 7.about 1030; exactly 1036
  8. 8.about 1040; exactly 1037

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