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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 185 · 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. 1.21 + 23 =
  2. 2.77 + 69 =
  3. 3.79 + 67 =
  4. 4.35 + 18 =
  5. 5.65 + 76 =
  6. 6.60 + 57 =
  7. 7.59 + 67 =
  8. 8.36 + 72 =
  9. 9.22 + 58 =
  10. 10.83 + 21 =
  11. 11.33 + 18 =
  12. 12.40 + 54 =
  13. 13.44 + 24 =
  14. 14.75 + 86 =
  15. 15.76 + 63 =
  16. 16.63 + 41 =
  17. 17.58 + 33 =
  18. 18.40 + 13 =
  19. 19.61 + 61 =
  20. 20.48 + 21 =
  21. 21.64 + 51 =
  22. 22.89 + 81 =
  23. 23.34 + 22 =
  24. 24.56 + 33 =
  25. 25.65 + 13 =
  26. 26.28 + 82 =
  27. 27.75 + 32 =
  28. 28.66 + 81 =
  29. 29.24 + 71 =
  30. 30.35 + 86 =
  31. 31.66 + 12 =
  32. 32.22 + 43 =
  33. 33.80 + 67 =
  34. 34.81 + 16 =
  35. 35.81 + 26 =
  36. 36.40 + 41 =
  37. 37.67 + 23 =
  38. 38.59 + 45 =
  39. 39.42 + 68 =
  40. 40.65 + 31 =

Answer key

  1. 44
  2. 146
  3. 146
  4. 53
  5. 141
  6. 117
  7. 126
  8. 108
  9. 80
  10. 104
  11. 51
  12. 94
  13. 68
  14. 161
  15. 139
  16. 104
  17. 91
  18. 53
  19. 122
  20. 69
  21. 115
  22. 170
  23. 56
  24. 89
  25. 78
  26. 110
  27. 107
  28. 147
  29. 95
  30. 121
  31. 78
  32. 65
  33. 147
  34. 97
  35. 107
  36. 81
  37. 90
  38. 104
  39. 110
  40. 96

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