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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 770 · 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. 1.35 + 45 =
  2. 2.40 + 81 =
  3. 3.70 + 77 =
  4. 4.30 + 12 =
  5. 5.59 + 22 =
  6. 6.51 + 72 =
  7. 7.50 + 21 =
  8. 8.77 + 17 =
  9. 9.73 + 21 =
  10. 10.72 + 83 =
  11. 11.35 + 18 =
  12. 12.66 + 64 =
  13. 13.49 + 67 =
  14. 14.63 + 37 =
  15. 15.62 + 26 =
  16. 16.37 + 81 =
  17. 17.49 + 16 =
  18. 18.42 + 21 =
  19. 19.74 + 36 =
  20. 20.24 + 86 =
  21. 21.77 + 75 =
  22. 22.83 + 31 =
  23. 23.40 + 64 =
  24. 24.82 + 25 =
  25. 25.36 + 32 =
  26. 26.41 + 66 =
  27. 27.88 + 85 =
  28. 28.78 + 64 =
  29. 29.47 + 74 =
  30. 30.38 + 39 =
  31. 31.28 + 65 =
  32. 32.84 + 79 =
  33. 33.69 + 34 =
  34. 34.69 + 77 =
  35. 35.83 + 12 =
  36. 36.36 + 27 =
  37. 37.56 + 24 =
  38. 38.80 + 42 =
  39. 39.49 + 39 =
  40. 40.75 + 61 =

Answer key

  1. 80
  2. 121
  3. 147
  4. 42
  5. 81
  6. 123
  7. 71
  8. 94
  9. 94
  10. 155
  11. 53
  12. 130
  13. 116
  14. 100
  15. 88
  16. 118
  17. 65
  18. 63
  19. 110
  20. 110
  21. 152
  22. 114
  23. 104
  24. 107
  25. 68
  26. 107
  27. 173
  28. 142
  29. 121
  30. 77
  31. 93
  32. 163
  33. 103
  34. 146
  35. 95
  36. 63
  37. 80
  38. 122
  39. 88
  40. 136

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