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Addition to 20 - Worksheet 1 - 1st Grade

Easy

Add with sums up to 20 (Easy)

20 problems · 10-15 minutes · Skills: addition, mental math

About This Worksheet

This easy-level worksheet contains 20 problems designed for 1st Grade students practicing addition to 20. Easy worksheets use simpler numbers and straightforward problem types to build confidence and reinforce foundational skills.

Addition to 20 introduces regrouping concepts and the powerful "make a ten" strategy that students will use throughout their math education.

How to Solve: Worked Example

Example Problem: 5 + 4 = ___
Solution Steps:
  1. Start with 5.
  2. Count on 4 more: 6, 7, 8, 9.
  3. 5 + 4 = 9.
Answer: 9
Tip: Always start counting from the bigger number to save time.
1
2 + 4 =
2
6 + 1 =
3
5 + 2 =
4
5 + 5 =
5
3 + 9 =
6
2 + 8 =
7
1 + 1 =
8
6 + 5 =
9
4 + 5 =
10
1 + 1 =
11
5 + 7 =
12
4 + 8 =
13
4 + 8 =
14
3 + 2 =
15
2 + 7 =
16
2 + 3 =
17
3 + 2 =
18
6 + 1 =
19
1 + 11 =
20
1 + 4 =

Answer Key

1. 62. 73. 74. 105. 126. 107. 28. 119. 910. 211. 1212. 1213. 1214. 515. 916. 517. 518. 719. 1220. 5

Frequently Asked Questions

How do I download this addition to 20 - worksheet 1 worksheet?

Click the "Download PDF / Print" button at the top of the worksheet. You can save it as a PDF or print it directly. The answer key will be on a separate page.

How do I find worksheets at different difficulty levels?

Each subtopic has 10 worksheets: Worksheets 1-3 are Easy, 4-7 are Medium, and 8-10 are Hard. Start with Easy worksheets to build confidence, then progress to harder ones.

How many problems are on this worksheet?

This worksheet contains 20 problems. It typically takes 10-15 minutes to complete. An answer key with all solutions is included.