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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 37 · 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. 1.35 + 16 =
  2. 2.30 + 85 =
  3. 3.28 + 27 =
  4. 4.41 + 81 =
  5. 5.36 + 76 =
  6. 6.82 + 54 =
  7. 7.28 + 76 =
  8. 8.81 + 28 =
  9. 9.49 + 34 =
  10. 10.64 + 22 =
  11. 11.71 + 57 =
  12. 12.88 + 65 =
  13. 13.25 + 81 =
  14. 14.78 + 32 =
  15. 15.72 + 77 =
  16. 16.49 + 45 =
  17. 17.67 + 52 =
  18. 18.27 + 88 =
  19. 19.32 + 74 =
  20. 20.60 + 29 =
  21. 21.89 + 33 =
  22. 22.61 + 41 =
  23. 23.69 + 41 =
  24. 24.29 + 68 =
  25. 25.71 + 22 =
  26. 26.72 + 71 =
  27. 27.41 + 27 =
  28. 28.36 + 66 =
  29. 29.84 + 57 =
  30. 30.67 + 15 =
  31. 31.34 + 36 =
  32. 32.36 + 25 =
  33. 33.49 + 61 =
  34. 34.77 + 87 =
  35. 35.23 + 84 =
  36. 36.50 + 82 =
  37. 37.77 + 18 =
  38. 38.40 + 89 =
  39. 39.69 + 78 =
  40. 40.56 + 79 =

Answer key

  1. 51
  2. 115
  3. 55
  4. 122
  5. 112
  6. 136
  7. 104
  8. 109
  9. 83
  10. 86
  11. 128
  12. 153
  13. 106
  14. 110
  15. 149
  16. 94
  17. 119
  18. 115
  19. 106
  20. 89
  21. 122
  22. 102
  23. 110
  24. 97
  25. 93
  26. 143
  27. 68
  28. 102
  29. 141
  30. 82
  31. 70
  32. 61
  33. 110
  34. 164
  35. 107
  36. 132
  37. 95
  38. 129
  39. 147
  40. 135

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