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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 67 · 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. 1.21 + 15 =
  2. 2.78 + 89 =
  3. 3.65 + 59 =
  4. 4.39 + 58 =
  5. 5.41 + 41 =
  6. 6.54 + 75 =
  7. 7.30 + 53 =
  8. 8.50 + 13 =
  9. 9.74 + 87 =
  10. 10.71 + 19 =
  11. 11.57 + 53 =
  12. 12.79 + 54 =
  13. 13.26 + 32 =
  14. 14.51 + 37 =
  15. 15.58 + 81 =
  16. 16.77 + 53 =
  17. 17.22 + 16 =
  18. 18.61 + 69 =
  19. 19.33 + 13 =
  20. 20.32 + 21 =
  21. 21.28 + 62 =
  22. 22.33 + 58 =
  23. 23.36 + 66 =
  24. 24.39 + 43 =
  25. 25.49 + 42 =
  26. 26.35 + 21 =
  27. 27.29 + 16 =
  28. 28.29 + 49 =
  29. 29.84 + 81 =
  30. 30.39 + 86 =
  31. 31.45 + 27 =
  32. 32.63 + 83 =
  33. 33.72 + 81 =
  34. 34.26 + 63 =
  35. 35.74 + 67 =
  36. 36.53 + 58 =
  37. 37.88 + 31 =
  38. 38.44 + 73 =
  39. 39.87 + 17 =
  40. 40.54 + 65 =

Answer key

  1. 36
  2. 167
  3. 124
  4. 97
  5. 82
  6. 129
  7. 83
  8. 63
  9. 161
  10. 90
  11. 110
  12. 133
  13. 58
  14. 88
  15. 139
  16. 130
  17. 38
  18. 130
  19. 46
  20. 53
  21. 90
  22. 91
  23. 102
  24. 82
  25. 91
  26. 56
  27. 45
  28. 78
  29. 165
  30. 125
  31. 72
  32. 146
  33. 153
  34. 89
  35. 141
  36. 111
  37. 119
  38. 117
  39. 104
  40. 119

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