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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 551 · 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 + 12 =
  2. 2.73 + 14 =
  3. 3.45 + 67 =
  4. 4.45 + 26 =
  5. 5.79 + 18 =
  6. 6.34 + 89 =
  7. 7.47 + 44 =
  8. 8.82 + 49 =
  9. 9.46 + 81 =
  10. 10.28 + 12 =
  11. 11.76 + 31 =
  12. 12.83 + 27 =
  13. 13.86 + 38 =
  14. 14.82 + 41 =
  15. 15.54 + 25 =
  16. 16.64 + 26 =
  17. 17.73 + 66 =
  18. 18.59 + 64 =
  19. 19.35 + 51 =
  20. 20.43 + 82 =
  21. 21.70 + 29 =
  22. 22.57 + 73 =
  23. 23.82 + 82 =
  24. 24.63 + 28 =
  25. 25.80 + 81 =
  26. 26.34 + 79 =
  27. 27.29 + 71 =
  28. 28.50 + 79 =
  29. 29.51 + 18 =
  30. 30.76 + 83 =
  31. 31.61 + 41 =
  32. 32.57 + 36 =
  33. 33.75 + 73 =
  34. 34.41 + 62 =
  35. 35.35 + 85 =
  36. 36.70 + 21 =
  37. 37.31 + 65 =
  38. 38.83 + 79 =
  39. 39.40 + 81 =
  40. 40.76 + 61 =

Answer key

  1. 51
  2. 87
  3. 112
  4. 71
  5. 97
  6. 123
  7. 91
  8. 131
  9. 127
  10. 40
  11. 107
  12. 110
  13. 124
  14. 123
  15. 79
  16. 90
  17. 139
  18. 123
  19. 86
  20. 125
  21. 99
  22. 130
  23. 164
  24. 91
  25. 161
  26. 113
  27. 100
  28. 129
  29. 69
  30. 159
  31. 102
  32. 93
  33. 148
  34. 103
  35. 120
  36. 91
  37. 96
  38. 162
  39. 121
  40. 137

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