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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 16 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 401 − 353 by rounding each number to the nearest hundred, then work it out.
2.Estimate 951 − 326 by rounding each number to the nearest hundred, then work it out.
3.Estimate 515 − 319 by rounding each number to the nearest hundred, then work it out.
4.Estimate 405 − 303 by rounding each number to the nearest hundred, then work it out.
5.Estimate 906 − 225 by rounding each number to the nearest hundred, then work it out.
6.Estimate 663 − 336 by rounding each number to the nearest hundred, then work it out.
7.Estimate 767 − 233 by rounding each number to the nearest hundred, then work it out.
8.Estimate 912 − 268 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 16 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 16. Prints on its own sheet.

  1. 1.about 0; exactly 48
  2. 2.about 700; exactly 625
  3. 3.about 200; exactly 196
  4. 4.about 100; exactly 102
  5. 5.about 700; exactly 681
  6. 6.about 400; exactly 327
  7. 7.about 600; exactly 534
  8. 8.about 600; exactly 644

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