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Add Two-Digit Numbers is a free printable Grade 1 math worksheet on two-digit addition without regrouping, sums below 100, 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 students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

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All 25 sets ask different questions.

Add Two-Digit Numbers

1.NBT.C.4

NameDate

Work out each answer.

1.47 + 11 =
2.22 + 33 =
3.44 + 13 =
4.43 + 21 =
5.36 + 32 =
6.36 + 13 =
7.13 + 43 =
8.11 + 33 =
9.12 + 36 =
10.20 + 14 =
11.30 + 33 =
12.47 + 12 =

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

Answer key — Add Two-Digit Numbers

Set 1. Prints on its own sheet.

  1. 1.58
  2. 2.55
  3. 3.57
  4. 4.64
  5. 5.68
  6. 6.49
  7. 7.56
  8. 8.44
  9. 9.48
  10. 10.34
  11. 11.63
  12. 12.59

Questions about Add Two-Digit Numbers

What does the Add Two-Digit Numbers worksheet cover?

It practices two-digit addition without regrouping, sums below 100 — 12 questions for Grade 1, all on Common Core 1.NBT.C.4: Add numbers up to 100. The instruction to students is “Work out each answer”, and the answer key follows on the next sheet.

Which Common Core standard does Add Two-Digit Numbers practice?

CCSS.MATH.CONTENT.1.NBT.C.4 — 1.NBT.C.4, under Number & Operations in Base Ten for Grade 1. The published standard reads: “Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Add Two-Digit Numbers is written for Grade 1, typically ages 6-7. It is one of the sheets on 1.NBT.C.4, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.

Does Add Two-Digit Numbers 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 Add Two-Digit Numbers 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 Add Two-Digit Numbers free to print and photocopy?

Yes. Add Two-Digit Numbers, 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.

More practice for 1.NBT.C.4

Add numbers up to 100.

All Grade 1 worksheets

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