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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 14 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 749 − 384 by rounding each number to the nearest hundred, then work it out.
2.Estimate 900 − 191 by rounding each number to the nearest hundred, then work it out.
3.Estimate 941 − 346 by rounding each number to the nearest hundred, then work it out.
4.Estimate 408 − 301 by rounding each number to the nearest hundred, then work it out.
5.Estimate 887 − 372 by rounding each number to the nearest hundred, then work it out.
6.Estimate 633 − 151 by rounding each number to the nearest hundred, then work it out.
7.Estimate 405 − 229 by rounding each number to the nearest hundred, then work it out.
8.Estimate 697 − 143 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 14 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 14. Prints on its own sheet.

  1. 1.about 300; exactly 365
  2. 2.about 700; exactly 709
  3. 3.about 600; exactly 595
  4. 4.about 100; exactly 107
  5. 5.about 500; exactly 515
  6. 6.about 400; exactly 482
  7. 7.about 200; exactly 176
  8. 8.about 600; exactly 554

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