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Grade 1 Adding a One-Digit Number to a Two-Digit Number Worksheet with Answers

Grade 1 (US) · Year 2 (UK) · Class 1 (India) · Math

Unit 3: Adding & Subtracting within 100Two-Digit AdditionCCSS 1.NBT.C.4

Adding one-digit numbers to two-digit numbers, with and without making a new ten. This free early elementary worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Adding a One-Digit Number to a Two-Digit Number

Grade 1 · Math

Score___ / 12

Name

Class

Date

Learning goal: Two-Digit Addition · CCSS 1.NBT.C.4

Directions: Solve each problem. Show your work, then write your answer in the box.

Example

84 + 5 = ?

Answer: 89

RememberAdding with regrouping

1
64 + 9 = ?
Answer
2
36 + 7 = ?
Answer
3
24 + 8 = ?
Answer
4
67 + 3 = ?
Answer
5
84 + 7 = ?
Answer
6
65 + 5 = ?
Answer
7
18 + 6 = ?
Answer
8
85 + 5 = ?
Answer
9
73 + 8 = ?
Answer
10
67 + 9 = ?
Answer
11
87 + 3 = ?
Answer
12
45 + 7 = ?
Answer

★ Challenge corner for fast finishers

I am thinking of a number. If I add 9, I get 17. What is my number?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/math/1/add_2d_1d

Answer key (click to show)

1.73
2.43
3.32
4.70
5.91
6.70
7.24
8.90
9.81
10.76
11.90
12.52
★8 (challenge corner)

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How to use this worksheet

Keep it short: a few questions at a time works better than a whole page at once for young learners.
Read the questions aloud together if your child is still building reading confidence.
Check the answers straight after, while the thinking is still fresh, and praise effort as well as results.

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Frequently asked questions

Does this Grade 1 Adding a One-Digit Number to a Two-Digit Number worksheet come with answers?

Yes. The full answer key is on this page, and it prints on its own page after the questions. Every answer is calculated or checked by code rather than written by an AI model, so the key is always correct.

How do I print it or save it as a PDF?

Click "Download PDF" to save a ready-to-print PDF with the answer key on the last page, or click "Print" to send the worksheet and answer key straight to your printer.

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Is this worksheet free?

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