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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 24 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 522 + 116 by rounding each number to the nearest ten, then work it out.
2.Estimate 570 + 127 by rounding each number to the nearest ten, then work it out.
3.Estimate 804 + 185 by rounding each number to the nearest ten, then work it out.
4.Estimate 231 + 856 by rounding each number to the nearest ten, then work it out.
5.Estimate 792 + 538 by rounding each number to the nearest ten, then work it out.
6.Estimate 120 + 593 by rounding each number to the nearest ten, then work it out.
7.Estimate 129 + 373 by rounding each number to the nearest ten, then work it out.
8.Estimate 503 + 794 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 24 · free to copy for classroom use

Answer key — Round then Estimate

Set 24. Prints on its own sheet.

  1. 1.about 640; exactly 638
  2. 2.about 700; exactly 697
  3. 3.about 990; exactly 989
  4. 4.about 1090; exactly 1087
  5. 5.about 1330; exactly 1330
  6. 6.about 710; exactly 713
  7. 7.about 500; exactly 502
  8. 8.about 1290; exactly 1297

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