Expanded Form to 99 is a free printable Grade 1 maths worksheet on writing a two-digit number as a sum, aligned to Common Core standard 1.NBT.B.2. 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 9 of 25 · the same problems every time you open this link.

One paper per pupil

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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

Expanded Form to 99

1.NBT.B.2

NameDate

Write each number in expanded form.

1.28 = ___ + ___

2.20 = ___ + ___

3.76 = ___ + ___

4.69 = ___ + ___

5.18 = ___ + ___

6.57 = ___ + ___

7.12 = ___ + ___

8.55 = ___ + ___

9.83 = ___ + ___

10.68 = ___ + ___

11.27 = ___ + ___

12.73 = ___ + ___

LessonPrint · 1.NBT.B.2 · Set 9 · free to copy for classroom use

Answer key — Expanded Form to 99

Set 9. Prints on its own sheet.

1.20 + 8
2.20 + 0
3.70 + 6
4.60 + 9
5.10 + 8
6.50 + 7
7.10 + 2
8.50 + 5
9.80 + 3
10.60 + 8
11.20 + 7
12.70 + 3

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