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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 699 · 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. 1.46 + 31 =
  2. 2.54 + 66 =
  3. 3.27 + 38 =
  4. 4.78 + 89 =
  5. 5.88 + 55 =
  6. 6.59 + 54 =
  7. 7.83 + 81 =
  8. 8.79 + 78 =
  9. 9.80 + 45 =
  10. 10.47 + 52 =
  11. 11.83 + 22 =
  12. 12.30 + 79 =
  13. 13.62 + 89 =
  14. 14.36 + 21 =
  15. 15.38 + 83 =
  16. 16.62 + 77 =
  17. 17.44 + 85 =
  18. 18.83 + 44 =
  19. 19.78 + 36 =
  20. 20.73 + 51 =
  21. 21.76 + 46 =
  22. 22.75 + 36 =
  23. 23.49 + 65 =
  24. 24.84 + 31 =
  25. 25.27 + 61 =
  26. 26.51 + 38 =
  27. 27.42 + 79 =
  28. 28.86 + 61 =
  29. 29.86 + 56 =
  30. 30.81 + 77 =
  31. 31.46 + 12 =
  32. 32.52 + 19 =
  33. 33.56 + 44 =
  34. 34.53 + 38 =
  35. 35.40 + 55 =
  36. 36.46 + 46 =
  37. 37.39 + 42 =
  38. 38.36 + 51 =
  39. 39.34 + 64 =
  40. 40.40 + 12 =

Answer key

  1. 77
  2. 120
  3. 65
  4. 167
  5. 143
  6. 113
  7. 164
  8. 157
  9. 125
  10. 99
  11. 105
  12. 109
  13. 151
  14. 57
  15. 121
  16. 139
  17. 129
  18. 127
  19. 114
  20. 124
  21. 122
  22. 111
  23. 114
  24. 115
  25. 88
  26. 89
  27. 121
  28. 147
  29. 142
  30. 158
  31. 58
  32. 71
  33. 100
  34. 91
  35. 95
  36. 92
  37. 81
  38. 87
  39. 98
  40. 52

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