Mental Addition Strategies

Name: _______________________________
Date: _______________________________

Part 1: Making Tens 🎯

Add by making one number into a ten first. Show your thinking.

Example: 8 + 5 = 8 + 2 + 3 = 10 + 3 = 13

1. 9 + 6 = __________

9 + _____ + _____ = 10 + _____ = _____

2. 7 + 8 = __________

7 + _____ + _____ = 10 + _____ = _____

3. 18 + 5 = __________

18 + _____ + _____ = 20 + _____ = _____

4. 29 + 7 = __________

29 + _____ + _____ = 30 + _____ = _____

Part 2: Using Number Bonds 🔗

Break apart numbers to make friendly additions.

Example: 26 + 8 = 26 + 4 + 4 = 30 + 4 = 34

5. 35 + 9 = _______________________________________________

6. 47 + 6 = _______________________________________________

7. 54 + 8 = _______________________________________________

8. 68 + 7 = _______________________________________________

Part 3: Breaking Apart Both Numbers ✂️

Split both numbers into tens and ones, then add.

Example: 34 + 25 = 30 + 20 + 4 + 5 = 50 + 9 = 59

9. 42 + 36 = _______________________________________________

10. 53 + 28 = _______________________________________________

11. 65 + 17 = _______________________________________________

Part 4: Choose Your Strategy 💡

Solve these problems using any mental strategy. Show your thinking!

12. 56 + 9 = _______________________________________________

13. 38 + 45 = _______________________________________________

14. 27 + 8 = _______________________________________________

15. 74 + 19 = _______________________________________________