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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 878 · 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. 1.66 + 15 =
  2. 2.70 + 81 =
  3. 3.80 + 74 =
  4. 4.89 + 79 =
  5. 5.25 + 83 =
  6. 6.76 + 73 =
  7. 7.24 + 31 =
  8. 8.54 + 87 =
  9. 9.47 + 52 =
  10. 10.24 + 25 =
  11. 11.52 + 19 =
  12. 12.44 + 15 =
  13. 13.48 + 77 =
  14. 14.54 + 79 =
  15. 15.47 + 76 =
  16. 16.69 + 13 =
  17. 17.75 + 56 =
  18. 18.42 + 77 =
  19. 19.46 + 79 =
  20. 20.86 + 37 =
  21. 21.73 + 44 =
  22. 22.21 + 51 =
  23. 23.35 + 17 =
  24. 24.33 + 51 =
  25. 25.83 + 39 =
  26. 26.62 + 25 =
  27. 27.71 + 14 =
  28. 28.56 + 48 =
  29. 29.73 + 69 =
  30. 30.55 + 35 =
  31. 31.78 + 21 =
  32. 32.33 + 67 =
  33. 33.41 + 29 =
  34. 34.71 + 36 =
  35. 35.69 + 46 =
  36. 36.43 + 69 =
  37. 37.80 + 64 =
  38. 38.52 + 38 =
  39. 39.26 + 58 =
  40. 40.64 + 18 =

Answer key

  1. 81
  2. 151
  3. 154
  4. 168
  5. 108
  6. 149
  7. 55
  8. 141
  9. 99
  10. 49
  11. 71
  12. 59
  13. 125
  14. 133
  15. 123
  16. 82
  17. 131
  18. 119
  19. 125
  20. 123
  21. 117
  22. 72
  23. 52
  24. 84
  25. 122
  26. 87
  27. 85
  28. 104
  29. 142
  30. 90
  31. 99
  32. 100
  33. 70
  34. 107
  35. 115
  36. 112
  37. 144
  38. 90
  39. 84
  40. 82

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