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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 230 · 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. 1.75 + 21 =
  2. 2.78 + 63 =
  3. 3.21 + 88 =
  4. 4.28 + 83 =
  5. 5.54 + 27 =
  6. 6.43 + 37 =
  7. 7.77 + 71 =
  8. 8.70 + 35 =
  9. 9.57 + 27 =
  10. 10.57 + 32 =
  11. 11.39 + 44 =
  12. 12.55 + 17 =
  13. 13.84 + 63 =
  14. 14.55 + 59 =
  15. 15.40 + 53 =
  16. 16.35 + 16 =
  17. 17.31 + 58 =
  18. 18.57 + 57 =
  19. 19.81 + 79 =
  20. 20.70 + 37 =
  21. 21.65 + 85 =
  22. 22.59 + 41 =
  23. 23.42 + 42 =
  24. 24.35 + 75 =
  25. 25.81 + 27 =
  26. 26.46 + 71 =
  27. 27.34 + 31 =
  28. 28.80 + 56 =
  29. 29.89 + 64 =
  30. 30.76 + 75 =
  31. 31.46 + 57 =
  32. 32.65 + 47 =
  33. 33.34 + 21 =
  34. 34.77 + 26 =
  35. 35.27 + 89 =
  36. 36.65 + 55 =
  37. 37.84 + 73 =
  38. 38.44 + 36 =
  39. 39.58 + 56 =
  40. 40.75 + 13 =

Answer key

  1. 96
  2. 141
  3. 109
  4. 111
  5. 81
  6. 80
  7. 148
  8. 105
  9. 84
  10. 89
  11. 83
  12. 72
  13. 147
  14. 114
  15. 93
  16. 51
  17. 89
  18. 114
  19. 160
  20. 107
  21. 150
  22. 100
  23. 84
  24. 110
  25. 108
  26. 117
  27. 65
  28. 136
  29. 153
  30. 151
  31. 103
  32. 112
  33. 55
  34. 103
  35. 116
  36. 120
  37. 157
  38. 80
  39. 114
  40. 88

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