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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 406 · 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. 1.50 + 73 =
  2. 2.88 + 41 =
  3. 3.54 + 85 =
  4. 4.21 + 36 =
  5. 5.22 + 65 =
  6. 6.53 + 51 =
  7. 7.42 + 81 =
  8. 8.21 + 16 =
  9. 9.39 + 13 =
  10. 10.83 + 37 =
  11. 11.74 + 55 =
  12. 12.43 + 23 =
  13. 13.76 + 64 =
  14. 14.37 + 45 =
  15. 15.85 + 79 =
  16. 16.82 + 59 =
  17. 17.31 + 31 =
  18. 18.87 + 73 =
  19. 19.59 + 24 =
  20. 20.55 + 31 =
  21. 21.50 + 63 =
  22. 22.70 + 52 =
  23. 23.83 + 19 =
  24. 24.89 + 14 =
  25. 25.43 + 29 =
  26. 26.81 + 31 =
  27. 27.44 + 34 =
  28. 28.75 + 23 =
  29. 29.36 + 23 =
  30. 30.75 + 12 =
  31. 31.72 + 27 =
  32. 32.71 + 32 =
  33. 33.88 + 71 =
  34. 34.26 + 72 =
  35. 35.68 + 29 =
  36. 36.83 + 61 =
  37. 37.43 + 69 =
  38. 38.62 + 84 =
  39. 39.53 + 33 =
  40. 40.79 + 51 =

Answer key

  1. 123
  2. 129
  3. 139
  4. 57
  5. 87
  6. 104
  7. 123
  8. 37
  9. 52
  10. 120
  11. 129
  12. 66
  13. 140
  14. 82
  15. 164
  16. 141
  17. 62
  18. 160
  19. 83
  20. 86
  21. 113
  22. 122
  23. 102
  24. 103
  25. 72
  26. 112
  27. 78
  28. 98
  29. 59
  30. 87
  31. 99
  32. 103
  33. 159
  34. 98
  35. 97
  36. 144
  37. 112
  38. 146
  39. 86
  40. 130

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