Grade 1 Addition: Addition within 20

Generate a printable Grade 1 addition worksheet for this skill. Change the difficulty, layout or problem count below, then print the worksheet or its answer key.

What students practice: Sums within 10 / within 20 are exactly the add-within-20 standard.

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What to practice

GradeDifficulty

OperationSkill

Worksheet options

Number of problemsLayout

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Worksheet preview — matches what “Print worksheet” produces.Grade 1 · Addition · Addition within 20 · Standard

Grade 1 · Addition

Addition Within 20

Name: Class: Date:

Set 1 · Grade 1 · Addition

Example problems by difficulty

Real samples from this generator. Every worksheet is a fresh random set, so yours will differ.

Easy

1 + 11 = ___
Answer: 12
1 + 10 = ___
Answer: 11

Standard

7 + 11 = ___
Answer: 18
15 + 4 = ___
Answer: 19

Challenge

9 + 8 = ___
Answer: 17
17 + 1 = ___
Answer: 18

Where this skill fits

Previous skill: Addition within 10
Next skill: Missing addends
All grades: Addition worksheets, Grades 1–5

Related Common Core standards

1.OA.C.6 — Add and subtract within 20.

The task matches what these standards describe at this grade. Common Core–informed practice; not a claim of official alignment.