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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 398 · 40 questions
TalentJR

How to do it in your head (Tens first): Keep the first number as it is. Add the tens of the second number. Add the ones.

NameDateTime takenScore ___ / 40
  1. 1.59 + 24 =
  2. 2.76 + 71 =
  3. 3.39 + 25 =
  4. 4.89 + 18 =
  5. 5.38 + 88 =
  6. 6.48 + 53 =
  7. 7.75 + 75 =
  8. 8.35 + 51 =
  9. 9.23 + 85 =
  10. 10.50 + 71 =
  11. 11.43 + 78 =
  12. 12.25 + 84 =
  13. 13.27 + 88 =
  14. 14.37 + 61 =
  15. 15.26 + 89 =
  16. 16.68 + 72 =
  17. 17.68 + 58 =
  18. 18.73 + 58 =
  19. 19.29 + 48 =
  20. 20.46 + 84 =
  21. 21.41 + 52 =
  22. 22.40 + 21 =
  23. 23.41 + 29 =
  24. 24.35 + 79 =
  25. 25.21 + 51 =
  26. 26.37 + 43 =
  27. 27.24 + 47 =
  28. 28.56 + 41 =
  29. 29.54 + 22 =
  30. 30.26 + 73 =
  31. 31.72 + 32 =
  32. 32.32 + 71 =
  33. 33.79 + 61 =
  34. 34.52 + 77 =
  35. 35.39 + 39 =
  36. 36.66 + 33 =
  37. 37.34 + 16 =
  38. 38.51 + 29 =
  39. 39.29 + 76 =
  40. 40.69 + 36 =

Answer key

  1. 83
  2. 147
  3. 64
  4. 107
  5. 126
  6. 101
  7. 150
  8. 86
  9. 108
  10. 121
  11. 121
  12. 109
  13. 115
  14. 98
  15. 115
  16. 140
  17. 126
  18. 131
  19. 77
  20. 130
  21. 93
  22. 61
  23. 70
  24. 114
  25. 72
  26. 80
  27. 71
  28. 97
  29. 76
  30. 99
  31. 104
  32. 103
  33. 140
  34. 129
  35. 78
  36. 99
  37. 50
  38. 80
  39. 105
  40. 105

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