Finding Missing Numbers in Number Sentences
Name: _______________________________
Date: _______________________________
Instructions: Find the missing number that makes each number sentence true. Write your answer on the line.
Part A: Addition Number Sentences
1.
5 + _______ = 12
2.
_______ + 7 = 15
3.
9 + _______ = 18
4.
_______ + 6 = 14
5.
11 + _______ = 20
6.
_______ + 4 = 13
Part B: Subtraction Number Sentences
7.
16 - _______ = 9
8.
_______ - 5 = 8
9.
20 - _______ = 12
10.
_______ - 7 = 6
11.
17 - _______ = 10
12.
_______ - 9 = 5
Part C: Mixed Practice
13.
8 + _______ = 17
14.
15 - _______ = 7
15.
_______ + 12 = 19
16.
_______ - 8 = 11
💡 Tip: Think about what number you need to add or subtract to make the sentence true!