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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 29 · 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. 1.39 + 21 =
  2. 2.56 + 62 =
  3. 3.42 + 58 =
  4. 4.87 + 71 =
  5. 5.65 + 28 =
  6. 6.86 + 34 =
  7. 7.42 + 89 =
  8. 8.70 + 48 =
  9. 9.64 + 81 =
  10. 10.55 + 39 =
  11. 11.74 + 71 =
  12. 12.36 + 76 =
  13. 13.78 + 77 =
  14. 14.50 + 37 =
  15. 15.83 + 61 =
  16. 16.83 + 26 =
  17. 17.66 + 41 =
  18. 18.89 + 19 =
  19. 19.33 + 41 =
  20. 20.72 + 54 =
  21. 21.34 + 32 =
  22. 22.63 + 57 =
  23. 23.37 + 66 =
  24. 24.78 + 79 =
  25. 25.32 + 17 =
  26. 26.53 + 51 =
  27. 27.86 + 61 =
  28. 28.42 + 82 =
  29. 29.25 + 51 =
  30. 30.78 + 87 =
  31. 31.49 + 18 =
  32. 32.48 + 51 =
  33. 33.85 + 63 =
  34. 34.33 + 48 =
  35. 35.43 + 82 =
  36. 36.77 + 29 =
  37. 37.80 + 78 =
  38. 38.69 + 81 =
  39. 39.87 + 81 =
  40. 40.35 + 35 =

Answer key

  1. 60
  2. 118
  3. 100
  4. 158
  5. 93
  6. 120
  7. 131
  8. 118
  9. 145
  10. 94
  11. 145
  12. 112
  13. 155
  14. 87
  15. 144
  16. 109
  17. 107
  18. 108
  19. 74
  20. 126
  21. 66
  22. 120
  23. 103
  24. 157
  25. 49
  26. 104
  27. 147
  28. 124
  29. 76
  30. 165
  31. 67
  32. 99
  33. 148
  34. 81
  35. 125
  36. 106
  37. 158
  38. 150
  39. 168
  40. 70

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