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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 23 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 527 − 172 by rounding each number to the nearest hundred, then work it out.
2.Estimate 417 − 337 by rounding each number to the nearest hundred, then work it out.
3.Estimate 990 − 378 by rounding each number to the nearest hundred, then work it out.
4.Estimate 588 − 352 by rounding each number to the nearest hundred, then work it out.
5.Estimate 723 − 258 by rounding each number to the nearest hundred, then work it out.
6.Estimate 589 − 380 by rounding each number to the nearest hundred, then work it out.
7.Estimate 455 − 112 by rounding each number to the nearest hundred, then work it out.
8.Estimate 901 − 287 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 23 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 23. Prints on its own sheet.

  1. 1.about 300; exactly 355
  2. 2.about 100; exactly 80
  3. 3.about 600; exactly 612
  4. 4.about 200; exactly 236
  5. 5.about 400; exactly 465
  6. 6.about 200; exactly 209
  7. 7.about 400; exactly 343
  8. 8.about 600; exactly 614

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