Online reading & math for K-5 © www.k5learning.com

Mental math: adding two 2-digit numbers(sum under 100)Grade 4 Addition WorksheetFind the sum.1. 28 + 10 = 2. 22 + 44 =

3. 51 + 19 = 4. 70 + 18 =

5. 60 + 12 = 6. 29 + 66 =

7. 21 + 66 = 8. 30 + 18 =

9. 11 + 4 = 10. 89 + 12 =

11. 18 + 72 = 12. 28 + 67 =

13. 31 + 55 = 14. 13 + 45 =

15. 32 + 31 = 16. 13 + 49 =

17. 68 + 34 = 18. 2 + 28 =

19. 43 + 10 = 20. 22 + 55 =

Online reading & math for K-5 © www.k5learning.com

Mental math: adding two 2-digit numbers(sum under 100)Grade 4 Addition WorksheetFind the sum.1. 28 + 10 = 38 2. 22 + 44 = 66

3. 51 + 19 = 70 4. 70 + 18 = 88

5. 60 + 12 = 72 6. 29 + 66 = 95

7. 21 + 66 = 87 8. 30 + 18 = 48

9. 11 + 4 = 15 10. 89 + 12 = 101

11. 18 + 72 = 90 12. 28 + 67 = 95

13. 31 + 55 = 86 14. 13 + 45 = 58

15. 32 + 31 = 63 16. 13 + 49 = 62

17. 68 + 34 = 102 18. 2 + 28 = 30

19. 43 + 10 = 53 20. 22 + 55 = 77