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Three Addends - Worksheet 6 - 1st Grade

Medium

Add three single-digit numbers (Medium)

18 problems · 10-15 minutes · Skills: addition, multi-step

About This Worksheet

This medium-level worksheet contains 18 problems designed for 1st Grade students practicing adding three numbers. Medium worksheets introduce larger numbers and varied question formats to deepen understanding and build fluency.

Adding three numbers requires students to think strategically about which numbers to add first, developing flexible mathematical thinking.

How to Solve: Worked Example

Example Problem: 4 + 3 + 6 = ___
Solution Steps:
  1. Look for friendly numbers: 4 + 6 = 10!
  2. Now add the remaining: 10 + 3 = 13.
Answer: 13
Tip: You can add numbers in any order. Look for combinations that make 10 first!
1
3 + 6 + 3 =
2
2 + 4 + 2 =
3
5 + 5 + 6 =
4
1 + 4 + 1 =
5
4 + 3 + 5 =
6
5 + 4 + 5 =
7
3 + 1 + 2 =
8
5 + 4 + 4 =
9
4 + 5 + 1 =
10
3 + 3 + 3 =
11
1 + 6 + 1 =
12
1 + 5 + 4 =
13
6 + 5 + 4 =
14
5 + 4 + 1 =
15
3 + 6 + 1 =
16
4 + 6 + 3 =
17
2 + 3 + 4 =
18
2 + 4 + 4 =

Answer Key

1. 122. 83. 164. 65. 126. 147. 68. 139. 1010. 911. 812. 1013. 1514. 1015. 1016. 1317. 918. 10

Frequently Asked Questions

How do I download this three addends - worksheet 6 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 18 problems. It typically takes 10-15 minutes to complete. An answer key with all solutions is included.