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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 720 · 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. 1.66 + 57 =
  2. 2.74 + 81 =
  3. 3.67 + 41 =
  4. 4.85 + 81 =
  5. 5.81 + 78 =
  6. 6.35 + 56 =
  7. 7.52 + 79 =
  8. 8.65 + 85 =
  9. 9.80 + 57 =
  10. 10.21 + 85 =
  11. 11.68 + 66 =
  12. 12.39 + 31 =
  13. 13.43 + 58 =
  14. 14.54 + 44 =
  15. 15.67 + 28 =
  16. 16.48 + 63 =
  17. 17.35 + 14 =
  18. 18.65 + 22 =
  19. 19.81 + 57 =
  20. 20.79 + 23 =
  21. 21.25 + 57 =
  22. 22.88 + 87 =
  23. 23.80 + 33 =
  24. 24.75 + 36 =
  25. 25.70 + 15 =
  26. 26.66 + 48 =
  27. 27.81 + 28 =
  28. 28.52 + 86 =
  29. 29.37 + 72 =
  30. 30.45 + 57 =
  31. 31.27 + 77 =
  32. 32.84 + 37 =
  33. 33.23 + 42 =
  34. 34.26 + 34 =
  35. 35.75 + 32 =
  36. 36.63 + 62 =
  37. 37.31 + 44 =
  38. 38.69 + 64 =
  39. 39.75 + 18 =
  40. 40.80 + 89 =

Answer key

  1. 123
  2. 155
  3. 108
  4. 166
  5. 159
  6. 91
  7. 131
  8. 150
  9. 137
  10. 106
  11. 134
  12. 70
  13. 101
  14. 98
  15. 95
  16. 111
  17. 49
  18. 87
  19. 138
  20. 102
  21. 82
  22. 175
  23. 113
  24. 111
  25. 85
  26. 114
  27. 109
  28. 138
  29. 109
  30. 102
  31. 104
  32. 121
  33. 65
  34. 60
  35. 107
  36. 125
  37. 75
  38. 133
  39. 93
  40. 169

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