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Three Addends - Worksheet 9 - 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
6 + 7 + 3 =
2
8 + 8 + 5 =
3
7 + 2 + 6 =
4
6 + 5 + 7 =
5
9 + 2 + 9 =
6
9 + 4 + 4 =
7
7 + 3 + 9 =
8
3 + 8 + 3 =
9
7 + 4 + 4 =
10
4 + 8 + 4 =
11
9 + 9 + 8 =
12
8 + 9 + 7 =
13
2 + 3 + 3 =
14
5 + 7 + 5 =
15
5 + 8 + 7 =
16
9 + 9 + 3 =
17
5 + 5 + 6 =
18
4 + 3 + 5 =
19
6 + 6 + 8 =
20
7 + 6 + 8 =
21
8 + 4 + 4 =
22
2 + 4 + 6 =
23
9 + 8 + 4 =

Answer Key

1. 162. 213. 154. 185. 206. 177. 198. 149. 1510. 1611. 2612. 2413. 814. 1715. 2016. 2117. 1618. 1219. 2020. 2121. 1622. 1223. 21

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.