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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 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.

Subtract Within 1000 — Estimate First

3.NBT.A.2

NameDate

Estimate first, then work it out.

1.Estimate 445 − 267 by rounding each number to the nearest hundred, then work it out.
2.Estimate 579 − 173 by rounding each number to the nearest hundred, then work it out.
3.Estimate 997 − 186 by rounding each number to the nearest hundred, then work it out.
4.Estimate 586 − 289 by rounding each number to the nearest hundred, then work it out.
5.Estimate 410 − 150 by rounding each number to the nearest hundred, then work it out.
6.Estimate 404 − 387 by rounding each number to the nearest hundred, then work it out.
7.Estimate 531 − 225 by rounding each number to the nearest hundred, then work it out.
8.Estimate 878 − 266 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 19 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 19. Prints on its own sheet.

  1. 1.about 100; exactly 178
  2. 2.about 400; exactly 406
  3. 3.about 800; exactly 811
  4. 4.about 300; exactly 297
  5. 5.about 200; exactly 260
  6. 6.about 0; exactly 17
  7. 7.about 300; exactly 306
  8. 8.about 600; exactly 612

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