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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 504 · 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. 1.26 + 28 =
  2. 2.77 + 78 =
  3. 3.29 + 74 =
  4. 4.24 + 83 =
  5. 5.88 + 32 =
  6. 6.75 + 16 =
  7. 7.23 + 87 =
  8. 8.63 + 16 =
  9. 9.78 + 81 =
  10. 10.60 + 86 =
  11. 11.77 + 66 =
  12. 12.49 + 51 =
  13. 13.58 + 65 =
  14. 14.50 + 31 =
  15. 15.67 + 27 =
  16. 16.24 + 76 =
  17. 17.25 + 89 =
  18. 18.33 + 54 =
  19. 19.53 + 15 =
  20. 20.79 + 62 =
  21. 21.43 + 79 =
  22. 22.28 + 52 =
  23. 23.36 + 13 =
  24. 24.30 + 86 =
  25. 25.49 + 74 =
  26. 26.66 + 39 =
  27. 27.55 + 78 =
  28. 28.69 + 51 =
  29. 29.68 + 52 =
  30. 30.53 + 83 =
  31. 31.22 + 87 =
  32. 32.86 + 54 =
  33. 33.64 + 74 =
  34. 34.28 + 58 =
  35. 35.86 + 58 =
  36. 36.57 + 44 =
  37. 37.46 + 74 =
  38. 38.79 + 42 =
  39. 39.31 + 66 =
  40. 40.83 + 19 =

Answer key

  1. 54
  2. 155
  3. 103
  4. 107
  5. 120
  6. 91
  7. 110
  8. 79
  9. 159
  10. 146
  11. 143
  12. 100
  13. 123
  14. 81
  15. 94
  16. 100
  17. 114
  18. 87
  19. 68
  20. 141
  21. 122
  22. 80
  23. 49
  24. 116
  25. 123
  26. 105
  27. 133
  28. 120
  29. 120
  30. 136
  31. 109
  32. 140
  33. 138
  34. 86
  35. 144
  36. 101
  37. 120
  38. 121
  39. 97
  40. 102

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