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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 100 · 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. 1.57 + 43 =
  2. 2.29 + 69 =
  3. 3.28 + 63 =
  4. 4.67 + 72 =
  5. 5.40 + 56 =
  6. 6.53 + 51 =
  7. 7.77 + 87 =
  8. 8.63 + 24 =
  9. 9.68 + 44 =
  10. 10.59 + 81 =
  11. 11.36 + 61 =
  12. 12.55 + 19 =
  13. 13.73 + 22 =
  14. 14.64 + 79 =
  15. 15.50 + 19 =
  16. 16.44 + 69 =
  17. 17.60 + 12 =
  18. 18.80 + 44 =
  19. 19.45 + 35 =
  20. 20.41 + 13 =
  21. 21.55 + 38 =
  22. 22.45 + 74 =
  23. 23.73 + 75 =
  24. 24.36 + 38 =
  25. 25.49 + 57 =
  26. 26.73 + 89 =
  27. 27.54 + 71 =
  28. 28.61 + 77 =
  29. 29.36 + 21 =
  30. 30.46 + 81 =
  31. 31.85 + 28 =
  32. 32.32 + 23 =
  33. 33.69 + 75 =
  34. 34.40 + 81 =
  35. 35.33 + 15 =
  36. 36.37 + 81 =
  37. 37.83 + 71 =
  38. 38.78 + 39 =
  39. 39.51 + 55 =
  40. 40.41 + 89 =

Answer key

  1. 100
  2. 98
  3. 91
  4. 139
  5. 96
  6. 104
  7. 164
  8. 87
  9. 112
  10. 140
  11. 97
  12. 74
  13. 95
  14. 143
  15. 69
  16. 113
  17. 72
  18. 124
  19. 80
  20. 54
  21. 93
  22. 119
  23. 148
  24. 74
  25. 106
  26. 162
  27. 125
  28. 138
  29. 57
  30. 127
  31. 113
  32. 55
  33. 144
  34. 121
  35. 48
  36. 118
  37. 154
  38. 117
  39. 106
  40. 130

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