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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 24 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 448 − 228 by rounding each number to the nearest hundred, then work it out.
2.Estimate 620 − 156 by rounding each number to the nearest hundred, then work it out.
3.Estimate 912 − 265 by rounding each number to the nearest hundred, then work it out.
4.Estimate 930 − 390 by rounding each number to the nearest hundred, then work it out.
5.Estimate 686 − 348 by rounding each number to the nearest hundred, then work it out.
6.Estimate 540 − 137 by rounding each number to the nearest hundred, then work it out.
7.Estimate 475 − 143 by rounding each number to the nearest hundred, then work it out.
8.Estimate 922 − 226 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 24 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 24. Prints on its own sheet.

  1. 1.about 200; exactly 220
  2. 2.about 400; exactly 464
  3. 3.about 600; exactly 647
  4. 4.about 500; exactly 540
  5. 5.about 400; exactly 338
  6. 6.about 400; exactly 403
  7. 7.about 400; exactly 332
  8. 8.about 700; exactly 696

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