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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 15 · 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 + 31 =
  2. 2.36 + 74 =
  3. 3.72 + 17 =
  4. 4.58 + 22 =
  5. 5.40 + 37 =
  6. 6.45 + 35 =
  7. 7.73 + 45 =
  8. 8.53 + 56 =
  9. 9.50 + 15 =
  10. 10.56 + 81 =
  11. 11.38 + 41 =
  12. 12.56 + 68 =
  13. 13.89 + 16 =
  14. 14.34 + 41 =
  15. 15.21 + 51 =
  16. 16.69 + 32 =
  17. 17.32 + 21 =
  18. 18.27 + 19 =
  19. 19.29 + 34 =
  20. 20.83 + 16 =
  21. 21.69 + 34 =
  22. 22.25 + 41 =
  23. 23.46 + 31 =
  24. 24.42 + 26 =
  25. 25.21 + 84 =
  26. 26.70 + 56 =
  27. 27.51 + 63 =
  28. 28.23 + 84 =
  29. 29.54 + 81 =
  30. 30.76 + 41 =
  31. 31.82 + 12 =
  32. 32.41 + 61 =
  33. 33.70 + 71 =
  34. 34.75 + 17 =
  35. 35.66 + 74 =
  36. 36.55 + 75 =
  37. 37.61 + 51 =
  38. 38.77 + 24 =
  39. 39.87 + 64 =
  40. 40.23 + 87 =

Answer key

  1. 66
  2. 110
  3. 89
  4. 80
  5. 77
  6. 80
  7. 118
  8. 109
  9. 65
  10. 137
  11. 79
  12. 124
  13. 105
  14. 75
  15. 72
  16. 101
  17. 53
  18. 46
  19. 63
  20. 99
  21. 103
  22. 66
  23. 77
  24. 68
  25. 105
  26. 126
  27. 114
  28. 107
  29. 135
  30. 117
  31. 94
  32. 102
  33. 141
  34. 92
  35. 140
  36. 130
  37. 112
  38. 101
  39. 151
  40. 110

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