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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 18 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 434 − 135 by rounding each number to the nearest hundred, then work it out.
2.Estimate 586 − 322 by rounding each number to the nearest hundred, then work it out.
3.Estimate 687 − 255 by rounding each number to the nearest hundred, then work it out.
4.Estimate 578 − 198 by rounding each number to the nearest hundred, then work it out.
5.Estimate 953 − 334 by rounding each number to the nearest hundred, then work it out.
6.Estimate 403 − 125 by rounding each number to the nearest hundred, then work it out.
7.Estimate 702 − 126 by rounding each number to the nearest hundred, then work it out.
8.Estimate 780 − 308 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 18 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 18. Prints on its own sheet.

  1. 1.about 300; exactly 299
  2. 2.about 300; exactly 264
  3. 3.about 400; exactly 432
  4. 4.about 400; exactly 380
  5. 5.about 700; exactly 619
  6. 6.about 300; exactly 278
  7. 7.about 600; exactly 576
  8. 8.about 500; exactly 472

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