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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 580 · 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. 1.42 + 75 =
  2. 2.67 + 56 =
  3. 3.56 + 32 =
  4. 4.25 + 32 =
  5. 5.45 + 18 =
  6. 6.33 + 75 =
  7. 7.88 + 36 =
  8. 8.21 + 33 =
  9. 9.31 + 52 =
  10. 10.36 + 17 =
  11. 11.39 + 63 =
  12. 12.85 + 84 =
  13. 13.32 + 35 =
  14. 14.57 + 25 =
  15. 15.59 + 59 =
  16. 16.40 + 18 =
  17. 17.34 + 84 =
  18. 18.29 + 32 =
  19. 19.56 + 65 =
  20. 20.82 + 65 =
  21. 21.80 + 81 =
  22. 22.51 + 52 =
  23. 23.60 + 68 =
  24. 24.83 + 12 =
  25. 25.35 + 67 =
  26. 26.59 + 21 =
  27. 27.51 + 17 =
  28. 28.42 + 14 =
  29. 29.66 + 55 =
  30. 30.29 + 61 =
  31. 31.37 + 31 =
  32. 32.53 + 34 =
  33. 33.54 + 64 =
  34. 34.58 + 16 =
  35. 35.43 + 16 =
  36. 36.65 + 38 =
  37. 37.35 + 43 =
  38. 38.84 + 71 =
  39. 39.49 + 89 =
  40. 40.59 + 35 =

Answer key

  1. 117
  2. 123
  3. 88
  4. 57
  5. 63
  6. 108
  7. 124
  8. 54
  9. 83
  10. 53
  11. 102
  12. 169
  13. 67
  14. 82
  15. 118
  16. 58
  17. 118
  18. 61
  19. 121
  20. 147
  21. 161
  22. 103
  23. 128
  24. 95
  25. 102
  26. 80
  27. 68
  28. 56
  29. 121
  30. 90
  31. 68
  32. 87
  33. 118
  34. 74
  35. 59
  36. 103
  37. 78
  38. 155
  39. 138
  40. 94

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