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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 71 · 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. 1.55 + 81 =
  2. 2.34 + 21 =
  3. 3.45 + 31 =
  4. 4.34 + 59 =
  5. 5.83 + 39 =
  6. 6.65 + 22 =
  7. 7.76 + 83 =
  8. 8.63 + 68 =
  9. 9.36 + 31 =
  10. 10.33 + 68 =
  11. 11.53 + 47 =
  12. 12.83 + 48 =
  13. 13.57 + 48 =
  14. 14.83 + 49 =
  15. 15.59 + 15 =
  16. 16.26 + 59 =
  17. 17.80 + 53 =
  18. 18.28 + 28 =
  19. 19.38 + 42 =
  20. 20.85 + 26 =
  21. 21.77 + 31 =
  22. 22.22 + 23 =
  23. 23.33 + 49 =
  24. 24.78 + 61 =
  25. 25.38 + 53 =
  26. 26.28 + 25 =
  27. 27.22 + 12 =
  28. 28.82 + 25 =
  29. 29.71 + 64 =
  30. 30.33 + 28 =
  31. 31.86 + 43 =
  32. 32.75 + 17 =
  33. 33.32 + 35 =
  34. 34.28 + 87 =
  35. 35.66 + 81 =
  36. 36.85 + 69 =
  37. 37.65 + 21 =
  38. 38.39 + 29 =
  39. 39.41 + 78 =
  40. 40.40 + 51 =

Answer key

  1. 136
  2. 55
  3. 76
  4. 93
  5. 122
  6. 87
  7. 159
  8. 131
  9. 67
  10. 101
  11. 100
  12. 131
  13. 105
  14. 132
  15. 74
  16. 85
  17. 133
  18. 56
  19. 80
  20. 111
  21. 108
  22. 45
  23. 82
  24. 139
  25. 91
  26. 53
  27. 34
  28. 107
  29. 135
  30. 61
  31. 129
  32. 92
  33. 67
  34. 115
  35. 147
  36. 154
  37. 86
  38. 68
  39. 119
  40. 91

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