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Add a One-Digit Number is a free printable Grade 1 maths worksheet on adding ones without regrouping, aligned to Common Core standard 1.NBT.C.4. It prints 16 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 22 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.

Add a One-Digit Number

1.NBT.C.4

NameDate

Work out each answer.

1.20 + 12 =
2.25 + 11 =
3.21 + 30 =
4.40 + 38 =
5.40 + 29 =
6.26 + 40 =
7.39 + 30 =
8.13 + 25 =
9.31 + 22 =
10.21 + 37 =
11.40 + 32 =
12.23 + 24 =
13.27 + 40 =
14.23 + 26 =
15.11 + 15 =
16.21 + 13 =

LessonPrint · 1.NBT.C.4 · Set 22 · free to copy for classroom use

Answer key — Add a One-Digit Number

Set 22. Prints on its own sheet.

  1. 1.32
  2. 2.36
  3. 3.51
  4. 4.78
  5. 5.69
  6. 6.66
  7. 7.69
  8. 8.38
  9. 9.53
  10. 10.58
  11. 11.72
  12. 12.47
  13. 13.67
  14. 14.49
  15. 15.26
  16. 16.34

More practice for 1.NBT.C.4

Add numbers up to 100.

Teaching this next? Adding Within 100 is the 40-minute plan for it, with the misconceptions to expect.

All Grade 1 worksheets

Last reviewed 2026-09-05. Aligned to 1.NBT.C.4 of the Common Core State Standards for mathematics.