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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 279 · 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. 1.55 + 72 =
  2. 2.67 + 71 =
  3. 3.28 + 79 =
  4. 4.32 + 68 =
  5. 5.79 + 87 =
  6. 6.23 + 68 =
  7. 7.32 + 85 =
  8. 8.31 + 31 =
  9. 9.31 + 47 =
  10. 10.66 + 28 =
  11. 11.34 + 33 =
  12. 12.28 + 61 =
  13. 13.54 + 79 =
  14. 14.58 + 23 =
  15. 15.41 + 35 =
  16. 16.75 + 61 =
  17. 17.84 + 56 =
  18. 18.72 + 74 =
  19. 19.52 + 25 =
  20. 20.43 + 83 =
  21. 21.55 + 61 =
  22. 22.37 + 53 =
  23. 23.46 + 18 =
  24. 24.30 + 88 =
  25. 25.71 + 17 =
  26. 26.52 + 85 =
  27. 27.24 + 42 =
  28. 28.24 + 76 =
  29. 29.42 + 17 =
  30. 30.74 + 46 =
  31. 31.22 + 61 =
  32. 32.36 + 88 =
  33. 33.24 + 73 =
  34. 34.81 + 19 =
  35. 35.85 + 57 =
  36. 36.85 + 19 =
  37. 37.87 + 64 =
  38. 38.39 + 66 =
  39. 39.59 + 35 =
  40. 40.36 + 77 =

Answer key

  1. 127
  2. 138
  3. 107
  4. 100
  5. 166
  6. 91
  7. 117
  8. 62
  9. 78
  10. 94
  11. 67
  12. 89
  13. 133
  14. 81
  15. 76
  16. 136
  17. 140
  18. 146
  19. 77
  20. 126
  21. 116
  22. 90
  23. 64
  24. 118
  25. 88
  26. 137
  27. 66
  28. 100
  29. 59
  30. 120
  31. 83
  32. 124
  33. 97
  34. 100
  35. 142
  36. 104
  37. 151
  38. 105
  39. 94
  40. 113

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