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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 812 · 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. 1.23 + 31 =
  2. 2.89 + 62 =
  3. 3.66 + 38 =
  4. 4.42 + 68 =
  5. 5.39 + 54 =
  6. 6.34 + 61 =
  7. 7.36 + 78 =
  8. 8.32 + 56 =
  9. 9.22 + 28 =
  10. 10.65 + 47 =
  11. 11.31 + 19 =
  12. 12.54 + 64 =
  13. 13.78 + 86 =
  14. 14.84 + 41 =
  15. 15.42 + 59 =
  16. 16.50 + 72 =
  17. 17.51 + 32 =
  18. 18.57 + 67 =
  19. 19.36 + 57 =
  20. 20.46 + 57 =
  21. 21.21 + 39 =
  22. 22.30 + 26 =
  23. 23.53 + 58 =
  24. 24.26 + 57 =
  25. 25.49 + 83 =
  26. 26.76 + 33 =
  27. 27.51 + 73 =
  28. 28.48 + 86 =
  29. 29.24 + 58 =
  30. 30.82 + 33 =
  31. 31.27 + 61 =
  32. 32.32 + 65 =
  33. 33.84 + 17 =
  34. 34.83 + 72 =
  35. 35.21 + 26 =
  36. 36.50 + 16 =
  37. 37.26 + 62 =
  38. 38.31 + 62 =
  39. 39.66 + 27 =
  40. 40.40 + 23 =

Answer key

  1. 54
  2. 151
  3. 104
  4. 110
  5. 93
  6. 95
  7. 114
  8. 88
  9. 50
  10. 112
  11. 50
  12. 118
  13. 164
  14. 125
  15. 101
  16. 122
  17. 83
  18. 124
  19. 93
  20. 103
  21. 60
  22. 56
  23. 111
  24. 83
  25. 132
  26. 109
  27. 124
  28. 134
  29. 82
  30. 115
  31. 88
  32. 97
  33. 101
  34. 155
  35. 47
  36. 66
  37. 88
  38. 93
  39. 93
  40. 63

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