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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 405 · 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. 1.40 + 83 =
  2. 2.21 + 31 =
  3. 3.62 + 17 =
  4. 4.83 + 65 =
  5. 5.31 + 75 =
  6. 6.81 + 24 =
  7. 7.35 + 49 =
  8. 8.78 + 31 =
  9. 9.60 + 69 =
  10. 10.55 + 64 =
  11. 11.56 + 46 =
  12. 12.52 + 26 =
  13. 13.85 + 88 =
  14. 14.84 + 28 =
  15. 15.60 + 19 =
  16. 16.51 + 42 =
  17. 17.47 + 59 =
  18. 18.36 + 37 =
  19. 19.54 + 77 =
  20. 20.61 + 45 =
  21. 21.54 + 31 =
  22. 22.69 + 89 =
  23. 23.38 + 63 =
  24. 24.59 + 67 =
  25. 25.41 + 12 =
  26. 26.29 + 81 =
  27. 27.72 + 77 =
  28. 28.36 + 25 =
  29. 29.61 + 31 =
  30. 30.28 + 64 =
  31. 31.50 + 37 =
  32. 32.67 + 17 =
  33. 33.78 + 61 =
  34. 34.79 + 62 =
  35. 35.77 + 17 =
  36. 36.78 + 27 =
  37. 37.30 + 13 =
  38. 38.21 + 59 =
  39. 39.53 + 28 =
  40. 40.80 + 64 =

Answer key

  1. 123
  2. 52
  3. 79
  4. 148
  5. 106
  6. 105
  7. 84
  8. 109
  9. 129
  10. 119
  11. 102
  12. 78
  13. 173
  14. 112
  15. 79
  16. 93
  17. 106
  18. 73
  19. 131
  20. 106
  21. 85
  22. 158
  23. 101
  24. 126
  25. 53
  26. 110
  27. 149
  28. 61
  29. 92
  30. 92
  31. 87
  32. 84
  33. 139
  34. 141
  35. 94
  36. 105
  37. 43
  38. 80
  39. 81
  40. 144

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