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Expanded Form to 999 is a free printable Grade 2 maths worksheet on writing a three-digit number as a sum, aligned to Common Core standard 2.NBT.A.1. It prints 12 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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One paper per pupil

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Expanded Form to 999

2.NBT.A.1

NameDate

Write each number in expanded form.

1.125 = ___ + ___ + ___
2.341 = ___ + ___ + ___
3.326 = ___ + ___ + ___
4.610 = ___ + ___ + ___
5.604 = ___ + ___ + ___
6.205 = ___ + ___ + ___
7.886 = ___ + ___ + ___
8.951 = ___ + ___ + ___
9.688 = ___ + ___ + ___
10.534 = ___ + ___ + ___
11.929 = ___ + ___ + ___
12.333 = ___ + ___ + ___

LessonPrint · 2.NBT.A.1 · Set 24 · free to copy for classroom use

Answer key — Expanded Form to 999

Set 24. Prints on its own sheet.

  1. 1.100 + 20 + 5
  2. 2.300 + 40 + 1
  3. 3.300 + 20 + 6
  4. 4.600 + 10 + 0
  5. 5.600 + 0 + 4
  6. 6.200 + 0 + 5
  7. 7.800 + 80 + 6
  8. 8.900 + 50 + 1
  9. 9.600 + 80 + 8
  10. 10.500 + 30 + 4
  11. 11.900 + 20 + 9
  12. 12.300 + 30 + 3

More practice for 2.NBT.A.1

Know what each digit means in a three-digit number.

Teaching this next? Hundreds, Tens and Ones in Three-Digit Numbers is the 45-minute plan for it, with the misconceptions to expect.

All Grade 2 worksheets

Last reviewed 2026-09-05. Aligned to 2.NBT.A.1 of the Common Core State Standards for mathematics.