Skip to content
LessonPrint

Expanded Form to 999 is a free printable Grade 2 math 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 students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 1 of 25 · the same problems every time you open this link.

Next setLesson plan

One paper per student

12345678910111213141516171819202122232425

All 25 sets ask different questions.

Expanded Form to 999

2.NBT.A.1

NameDate

Write each number in expanded form.

1.856 = ___ + ___ + ___
2.282 = ___ + ___ + ___
3.553 = ___ + ___ + ___
4.128 = ___ + ___ + ___
5.894 = ___ + ___ + ___
6.400 = ___ + ___ + ___
7.355 = ___ + ___ + ___
8.153 = ___ + ___ + ___
9.996 = ___ + ___ + ___
10.521 = ___ + ___ + ___
11.595 = ___ + ___ + ___
12.291 = ___ + ___ + ___

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

Answer key — Expanded Form to 999

Set 1. Prints on its own sheet.

  1. 1.800 + 50 + 6
  2. 2.200 + 80 + 2
  3. 3.500 + 50 + 3
  4. 4.100 + 20 + 8
  5. 5.800 + 90 + 4
  6. 6.400 + 0 + 0
  7. 7.300 + 50 + 5
  8. 8.100 + 50 + 3
  9. 9.900 + 90 + 6
  10. 10.500 + 20 + 1
  11. 11.500 + 90 + 5
  12. 12.200 + 90 + 1

Questions about Expanded Form to 999

What does the Expanded Form to 999 worksheet cover?

It practices writing a three-digit number as a sum — 12 questions for Grade 2, all on Common Core 2.NBT.A.1: Know what each digit means in a three-digit number. The instruction to students is “Write each number in expanded form”, and the answer key follows on the next sheet.

Which Common Core standard does Expanded Form to 999 practice?

CCSS.MATH.CONTENT.2.NBT.A.1 — 2.NBT.A.1, under Number & Operations in Base Ten for Grade 2. The published standard reads: “Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Expanded Form to 999 is written for Grade 2, typically ages 7-8. It is one of the sheets on 2.NBT.A.1, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.

Does Expanded Form to 999 come with an answer key?

Yes. All 12 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.

How many different versions of Expanded Form to 999 can I print?

25 — one per student, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.

Is Expanded Form to 999 free to print and photocopy?

Yes. Expanded Form to 999, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.

Is there a lesson plan to teach 2.NBT.A.1?

Yes — “Hundreds, Tens and Ones in Three-Digit Numbers” is a 45-minute Grade 2 plan for 2.NBT.A.1, timed section by section, with the misconceptions to expect and an exit ticket. Expanded Form to 999 is the practice that follows it.

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.