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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 631 · 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. 1.74 + 49 =
  2. 2.46 + 59 =
  3. 3.33 + 39 =
  4. 4.55 + 62 =
  5. 5.66 + 71 =
  6. 6.39 + 66 =
  7. 7.77 + 89 =
  8. 8.32 + 37 =
  9. 9.43 + 82 =
  10. 10.29 + 75 =
  11. 11.28 + 21 =
  12. 12.55 + 31 =
  13. 13.44 + 44 =
  14. 14.87 + 16 =
  15. 15.54 + 48 =
  16. 16.67 + 23 =
  17. 17.28 + 84 =
  18. 18.42 + 53 =
  19. 19.65 + 15 =
  20. 20.30 + 64 =
  21. 21.43 + 31 =
  22. 22.57 + 64 =
  23. 23.74 + 33 =
  24. 24.85 + 62 =
  25. 25.69 + 77 =
  26. 26.63 + 54 =
  27. 27.76 + 36 =
  28. 28.70 + 51 =
  29. 29.70 + 34 =
  30. 30.40 + 71 =
  31. 31.34 + 87 =
  32. 32.42 + 57 =
  33. 33.24 + 16 =
  34. 34.86 + 68 =
  35. 35.51 + 13 =
  36. 36.89 + 84 =
  37. 37.25 + 69 =
  38. 38.67 + 66 =
  39. 39.40 + 29 =
  40. 40.87 + 71 =

Answer key

  1. 123
  2. 105
  3. 72
  4. 117
  5. 137
  6. 105
  7. 166
  8. 69
  9. 125
  10. 104
  11. 49
  12. 86
  13. 88
  14. 103
  15. 102
  16. 90
  17. 112
  18. 95
  19. 80
  20. 94
  21. 74
  22. 121
  23. 107
  24. 147
  25. 146
  26. 117
  27. 112
  28. 121
  29. 104
  30. 111
  31. 121
  32. 99
  33. 40
  34. 154
  35. 64
  36. 173
  37. 94
  38. 133
  39. 69
  40. 158

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