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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 21 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 978 − 198 by rounding each number to the nearest hundred, then work it out.
2.Estimate 643 − 364 by rounding each number to the nearest hundred, then work it out.
3.Estimate 729 − 283 by rounding each number to the nearest hundred, then work it out.
4.Estimate 684 − 200 by rounding each number to the nearest hundred, then work it out.
5.Estimate 811 − 186 by rounding each number to the nearest hundred, then work it out.
6.Estimate 862 − 149 by rounding each number to the nearest hundred, then work it out.
7.Estimate 533 − 256 by rounding each number to the nearest hundred, then work it out.
8.Estimate 448 − 190 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 21 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 21. Prints on its own sheet.

  1. 1.about 800; exactly 780
  2. 2.about 200; exactly 279
  3. 3.about 400; exactly 446
  4. 4.about 500; exactly 484
  5. 5.about 600; exactly 625
  6. 6.about 800; exactly 713
  7. 7.about 200; exactly 277
  8. 8.about 200; exactly 258

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