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Adding to 100 — Mixed is a free printable Grade 1 maths worksheet on mixing all the two-digit addition cases, aligned to Common Core standard 1.NBT.C.4. 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 20 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.

Adding to 100 — Mixed

1.NBT.C.4

NameDate

Work out each answer.

1.15 + 48 =
2.95 + 79 =
3.55 + 45 =
4.67 + 47 =
5.38 + 26 =
6.77 + 14 =
7.13 + 54 =
8.34 + 14 =
9.41 + 97 =
10.77 + 30 =
11.40 + 83 =
12.93 + 52 =

LessonPrint · 1.NBT.C.4 · Set 20 · free to copy for classroom use

Answer key — Adding to 100 — Mixed

Set 20. Prints on its own sheet.

  1. 1.63
  2. 2.174
  3. 3.100
  4. 4.114
  5. 5.64
  6. 6.91
  7. 7.67
  8. 8.48
  9. 9.138
  10. 10.107
  11. 11.123
  12. 12.145

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