Missing Number Addition Problems
Name: _________________________
Date: _________________________
Instructions: Find the missing number in each addition equation. Show your working if needed.
Section A: One Missing Addend
1.
45 + _______ = 73
2.
_______ + 38 = 95
3.
126 + _______ = 204
4.
_______ + 87 = 152
5.
234 + _______ = 500
6.
_______ + 145 = 378
Section B: Three Addends
7.
25 + _______ + 18 = 67
8.
_______ + 42 + 35 = 110
9.
56 + 29 + _______ = 121
10.
_______ + 64 + 72 = 205
Section C: Larger Numbers
11.
456 + _______ = 891
12.
_______ + 678 = 1,234
13.
1,250 + _______ = 2,000
14.
_______ + 825 = 1,500
⭐ Challenge Problems
15.
_______ + 365 + 289 = 1,000
16.
427 + _______ + 198 = 850