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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 25 · 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 + 68 =
  2. 2.41 + 59 =
  3. 3.69 + 21 =
  4. 4.53 + 67 =
  5. 5.49 + 61 =
  6. 6.50 + 18 =
  7. 7.36 + 21 =
  8. 8.54 + 21 =
  9. 9.52 + 74 =
  10. 10.55 + 19 =
  11. 11.82 + 31 =
  12. 12.46 + 63 =
  13. 13.21 + 23 =
  14. 14.51 + 71 =
  15. 15.31 + 53 =
  16. 16.79 + 74 =
  17. 17.47 + 18 =
  18. 18.35 + 68 =
  19. 19.35 + 88 =
  20. 20.22 + 57 =
  21. 21.35 + 31 =
  22. 22.84 + 68 =
  23. 23.36 + 58 =
  24. 24.35 + 61 =
  25. 25.62 + 85 =
  26. 26.84 + 88 =
  27. 27.68 + 85 =
  28. 28.23 + 45 =
  29. 29.69 + 28 =
  30. 30.29 + 18 =
  31. 31.83 + 27 =
  32. 32.75 + 83 =
  33. 33.53 + 81 =
  34. 34.86 + 31 =
  35. 35.39 + 61 =
  36. 36.56 + 42 =
  37. 37.52 + 26 =
  38. 38.52 + 51 =
  39. 39.39 + 21 =
  40. 40.27 + 81 =

Answer key

  1. 100
  2. 100
  3. 90
  4. 120
  5. 110
  6. 68
  7. 57
  8. 75
  9. 126
  10. 74
  11. 113
  12. 109
  13. 44
  14. 122
  15. 84
  16. 153
  17. 65
  18. 103
  19. 123
  20. 79
  21. 66
  22. 152
  23. 94
  24. 96
  25. 147
  26. 172
  27. 153
  28. 68
  29. 97
  30. 47
  31. 110
  32. 158
  33. 134
  34. 117
  35. 100
  36. 98
  37. 78
  38. 103
  39. 60
  40. 108

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