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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 21 · 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. 1.32 + 54 =
  2. 2.67 + 41 =
  3. 3.50 + 89 =
  4. 4.83 + 44 =
  5. 5.63 + 25 =
  6. 6.82 + 85 =
  7. 7.51 + 12 =
  8. 8.83 + 84 =
  9. 9.73 + 81 =
  10. 10.56 + 38 =
  11. 11.45 + 78 =
  12. 12.28 + 78 =
  13. 13.80 + 31 =
  14. 14.84 + 29 =
  15. 15.31 + 41 =
  16. 16.28 + 61 =
  17. 17.29 + 58 =
  18. 18.74 + 87 =
  19. 19.71 + 15 =
  20. 20.80 + 63 =
  21. 21.51 + 32 =
  22. 22.27 + 13 =
  23. 23.80 + 74 =
  24. 24.81 + 53 =
  25. 25.69 + 31 =
  26. 26.37 + 28 =
  27. 27.25 + 51 =
  28. 28.39 + 67 =
  29. 29.39 + 39 =
  30. 30.48 + 36 =
  31. 31.45 + 45 =
  32. 32.32 + 61 =
  33. 33.50 + 44 =
  34. 34.52 + 13 =
  35. 35.71 + 34 =
  36. 36.50 + 38 =
  37. 37.38 + 33 =
  38. 38.41 + 78 =
  39. 39.60 + 81 =
  40. 40.83 + 42 =

Answer key

  1. 86
  2. 108
  3. 139
  4. 127
  5. 88
  6. 167
  7. 63
  8. 167
  9. 154
  10. 94
  11. 123
  12. 106
  13. 111
  14. 113
  15. 72
  16. 89
  17. 87
  18. 161
  19. 86
  20. 143
  21. 83
  22. 40
  23. 154
  24. 134
  25. 100
  26. 65
  27. 76
  28. 106
  29. 78
  30. 84
  31. 90
  32. 93
  33. 94
  34. 65
  35. 105
  36. 88
  37. 71
  38. 119
  39. 141
  40. 125

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