Addition Number Sentences and Equations
Name: _______________________________
Date: _______________________________
Instructions: Find the missing number to make each equation true. Remember, both sides of the equals sign must have the same value!
Part A: Find the Missing Number
1. 15 + 8 = 12 + __________
2. 24 + 9 = __________ + 17
3. __________ + 14 = 18 + 11
4. 35 + 6 = 25 + __________
5. 47 + 15 = 50 + __________
6. __________ + 23 = 31 + 19
7. 28 + 34 = 42 + __________
8. 56 + 18 = __________ + 29
9. 63 + 27 = 45 + __________
10. __________ + 38 = 52 + 44
Part B: Balance the Equations
11. 19 + __________ = 15 + 22
12. __________ + 26 = 38 + 14
13. 45 + 17 = __________ + 31
14. 54 + __________ = 67 + 8
15. __________ + 49 = 73 + 21
16. 88 + 12 = 65 + __________
Part C: Two Missing Numbers
Find a pair of numbers that makes each equation true. There may be more than one answer!
17. 20 + __________ = __________ + 15
18. 35 + __________ = __________ + 28
19. __________ + 16 = 30 + __________
20. __________ + 42 = 50 + __________
Challenge: Write your own balanced addition equation:
__________ + __________ = __________ + __________