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Subtract Within 1000 — Estimate First is a free printable Grade 3 maths worksheet on estimating a difference before working it out, aligned to Common Core standard 3.NBT.A.2. 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 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 22 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.

Subtract Within 1000 — Estimate First

3.NBT.A.2

NameDate

Estimate first, then work it out.

1.Estimate 982 − 129 by rounding each number to the nearest hundred, then work it out.
2.Estimate 448 − 278 by rounding each number to the nearest hundred, then work it out.
3.Estimate 595 − 136 by rounding each number to the nearest hundred, then work it out.
4.Estimate 798 − 159 by rounding each number to the nearest hundred, then work it out.
5.Estimate 848 − 392 by rounding each number to the nearest hundred, then work it out.
6.Estimate 905 − 222 by rounding each number to the nearest hundred, then work it out.
7.Estimate 617 − 300 by rounding each number to the nearest hundred, then work it out.
8.Estimate 974 − 355 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 22 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 22. Prints on its own sheet.

  1. 1.about 900; exactly 853
  2. 2.about 100; exactly 170
  3. 3.about 500; exactly 459
  4. 4.about 600; exactly 639
  5. 5.about 400; exactly 456
  6. 6.about 700; exactly 683
  7. 7.about 300; exactly 317
  8. 8.about 600; exactly 619

Last reviewed 2026-09-05. Aligned to 3.NBT.A.2 of the Common Core State Standards for Mathematics.