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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 146 · 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. 1.42 + 13 =
  2. 2.74 + 49 =
  3. 3.75 + 31 =
  4. 4.38 + 63 =
  5. 5.38 + 68 =
  6. 6.61 + 74 =
  7. 7.68 + 82 =
  8. 8.88 + 41 =
  9. 9.39 + 21 =
  10. 10.46 + 66 =
  11. 11.38 + 78 =
  12. 12.55 + 23 =
  13. 13.65 + 81 =
  14. 14.87 + 88 =
  15. 15.54 + 33 =
  16. 16.76 + 52 =
  17. 17.34 + 19 =
  18. 18.49 + 67 =
  19. 19.60 + 62 =
  20. 20.76 + 71 =
  21. 21.77 + 59 =
  22. 22.64 + 77 =
  23. 23.24 + 57 =
  24. 24.25 + 52 =
  25. 25.51 + 28 =
  26. 26.22 + 17 =
  27. 27.72 + 65 =
  28. 28.87 + 25 =
  29. 29.40 + 65 =
  30. 30.21 + 76 =
  31. 31.34 + 21 =
  32. 32.77 + 58 =
  33. 33.26 + 82 =
  34. 34.84 + 81 =
  35. 35.24 + 34 =
  36. 36.33 + 34 =
  37. 37.71 + 39 =
  38. 38.42 + 74 =
  39. 39.49 + 47 =
  40. 40.26 + 42 =

Answer key

  1. 55
  2. 123
  3. 106
  4. 101
  5. 106
  6. 135
  7. 150
  8. 129
  9. 60
  10. 112
  11. 116
  12. 78
  13. 146
  14. 175
  15. 87
  16. 128
  17. 53
  18. 116
  19. 122
  20. 147
  21. 136
  22. 141
  23. 81
  24. 77
  25. 79
  26. 39
  27. 137
  28. 112
  29. 105
  30. 97
  31. 55
  32. 135
  33. 108
  34. 165
  35. 58
  36. 67
  37. 110
  38. 116
  39. 96
  40. 68

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