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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 689 · 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. 1.38 + 17 =
  2. 2.69 + 61 =
  3. 3.50 + 32 =
  4. 4.81 + 89 =
  5. 5.76 + 17 =
  6. 6.37 + 45 =
  7. 7.63 + 24 =
  8. 8.27 + 55 =
  9. 9.36 + 47 =
  10. 10.23 + 71 =
  11. 11.52 + 82 =
  12. 12.86 + 26 =
  13. 13.63 + 72 =
  14. 14.59 + 23 =
  15. 15.63 + 13 =
  16. 16.54 + 72 =
  17. 17.22 + 34 =
  18. 18.88 + 76 =
  19. 19.55 + 86 =
  20. 20.50 + 66 =
  21. 21.73 + 61 =
  22. 22.36 + 17 =
  23. 23.77 + 12 =
  24. 24.68 + 41 =
  25. 25.80 + 23 =
  26. 26.79 + 51 =
  27. 27.81 + 26 =
  28. 28.39 + 78 =
  29. 29.56 + 24 =
  30. 30.83 + 68 =
  31. 31.24 + 18 =
  32. 32.28 + 45 =
  33. 33.57 + 18 =
  34. 34.52 + 12 =
  35. 35.25 + 58 =
  36. 36.28 + 76 =
  37. 37.70 + 55 =
  38. 38.58 + 17 =
  39. 39.58 + 57 =
  40. 40.34 + 58 =

Answer key

  1. 55
  2. 130
  3. 82
  4. 170
  5. 93
  6. 82
  7. 87
  8. 82
  9. 83
  10. 94
  11. 134
  12. 112
  13. 135
  14. 82
  15. 76
  16. 126
  17. 56
  18. 164
  19. 141
  20. 116
  21. 134
  22. 53
  23. 89
  24. 109
  25. 103
  26. 130
  27. 107
  28. 117
  29. 80
  30. 151
  31. 42
  32. 73
  33. 75
  34. 64
  35. 83
  36. 104
  37. 125
  38. 75
  39. 115
  40. 92

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