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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 165 · 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. 1.24 + 24 =
  2. 2.28 + 29 =
  3. 3.43 + 64 =
  4. 4.33 + 85 =
  5. 5.68 + 48 =
  6. 6.83 + 21 =
  7. 7.85 + 37 =
  8. 8.48 + 45 =
  9. 9.89 + 57 =
  10. 10.85 + 57 =
  11. 11.51 + 76 =
  12. 12.65 + 61 =
  13. 13.70 + 86 =
  14. 14.67 + 26 =
  15. 15.25 + 82 =
  16. 16.75 + 26 =
  17. 17.72 + 72 =
  18. 18.70 + 26 =
  19. 19.49 + 18 =
  20. 20.28 + 81 =
  21. 21.48 + 81 =
  22. 22.57 + 25 =
  23. 23.61 + 32 =
  24. 24.68 + 23 =
  25. 25.47 + 28 =
  26. 26.37 + 27 =
  27. 27.32 + 84 =
  28. 28.59 + 21 =
  29. 29.78 + 26 =
  30. 30.70 + 52 =
  31. 31.69 + 58 =
  32. 32.23 + 21 =
  33. 33.71 + 51 =
  34. 34.32 + 86 =
  35. 35.31 + 77 =
  36. 36.39 + 24 =
  37. 37.88 + 15 =
  38. 38.24 + 35 =
  39. 39.68 + 71 =
  40. 40.83 + 61 =

Answer key

  1. 48
  2. 57
  3. 107
  4. 118
  5. 116
  6. 104
  7. 122
  8. 93
  9. 146
  10. 142
  11. 127
  12. 126
  13. 156
  14. 93
  15. 107
  16. 101
  17. 144
  18. 96
  19. 67
  20. 109
  21. 129
  22. 82
  23. 93
  24. 91
  25. 75
  26. 64
  27. 116
  28. 80
  29. 104
  30. 122
  31. 127
  32. 44
  33. 122
  34. 118
  35. 108
  36. 63
  37. 103
  38. 59
  39. 139
  40. 144

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