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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 605 · 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. 1.54 + 51 =
  2. 2.61 + 61 =
  3. 3.61 + 89 =
  4. 4.58 + 61 =
  5. 5.32 + 84 =
  6. 6.26 + 58 =
  7. 7.42 + 27 =
  8. 8.89 + 15 =
  9. 9.23 + 51 =
  10. 10.60 + 77 =
  11. 11.49 + 52 =
  12. 12.68 + 57 =
  13. 13.39 + 78 =
  14. 14.48 + 37 =
  15. 15.33 + 75 =
  16. 16.32 + 79 =
  17. 17.74 + 81 =
  18. 18.83 + 78 =
  19. 19.57 + 79 =
  20. 20.57 + 54 =
  21. 21.40 + 73 =
  22. 22.26 + 21 =
  23. 23.29 + 76 =
  24. 24.49 + 21 =
  25. 25.24 + 89 =
  26. 26.79 + 13 =
  27. 27.83 + 21 =
  28. 28.72 + 69 =
  29. 29.60 + 75 =
  30. 30.40 + 35 =
  31. 31.39 + 63 =
  32. 32.30 + 78 =
  33. 33.36 + 72 =
  34. 34.59 + 84 =
  35. 35.81 + 41 =
  36. 36.87 + 81 =
  37. 37.40 + 23 =
  38. 38.46 + 27 =
  39. 39.66 + 89 =
  40. 40.51 + 32 =

Answer key

  1. 105
  2. 122
  3. 150
  4. 119
  5. 116
  6. 84
  7. 69
  8. 104
  9. 74
  10. 137
  11. 101
  12. 125
  13. 117
  14. 85
  15. 108
  16. 111
  17. 155
  18. 161
  19. 136
  20. 111
  21. 113
  22. 47
  23. 105
  24. 70
  25. 113
  26. 92
  27. 104
  28. 141
  29. 135
  30. 75
  31. 102
  32. 108
  33. 108
  34. 143
  35. 122
  36. 168
  37. 63
  38. 73
  39. 155
  40. 83

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