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Three Addends - Worksheet 8 - 1st Grade

Hard

Add three single-digit numbers (Hard)

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

About This Worksheet

This hard-level worksheet contains 23 problems designed for 1st Grade students practicing adding three numbers. Hard worksheets feature challenging problems including multi-step questions, missing values, and real-world applications to push students further.

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: 7 + 5 + 8 = ___
Solution Steps:
  1. Look for a pair that makes a near-ten: 7 + 8 = 15.
  2. Or use: 7 + 5 = 12, then 12 + 8 = 20.
  3. Either way, the answer is 20.
Answer: 20
Tip: With three addends, try different groupings to find the easiest way to add.
1
8 + 6 + 6 =
2
3 + 9 + 4 =
3
2 + 4 + 4 =
4
5 + 5 + 7 =
5
3 + 2 + 6 =
6
7 + 2 + 5 =
7
7 + 2 + 5 =
8
4 + 5 + 3 =
9
2 + 8 + 8 =
10
8 + 9 + 5 =
11
3 + 5 + 2 =
12
5 + 4 + 8 =
13
6 + 6 + 9 =
14
3 + 6 + 4 =
15
8 + 5 + 8 =
16
9 + 4 + 7 =
17
6 + 4 + 4 =
18
8 + 2 + 4 =
19
3 + 7 + 8 =
20
2 + 8 + 8 =
21
3 + 9 + 4 =
22
4 + 6 + 9 =
23
2 + 6 + 6 =

Answer Key

1. 202. 163. 104. 175. 116. 147. 148. 129. 1810. 2211. 1012. 1713. 2114. 1315. 2116. 2017. 1418. 1419. 1820. 1821. 1622. 1923. 14

Frequently Asked Questions

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How many problems are on this worksheet?

This worksheet contains 23 problems. It typically takes 10-15 minutes to complete. An answer key with all solutions is included.