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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 621 · 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 + 42 =
  2. 2.78 + 79 =
  3. 3.21 + 57 =
  4. 4.49 + 31 =
  5. 5.27 + 66 =
  6. 6.41 + 82 =
  7. 7.42 + 13 =
  8. 8.49 + 32 =
  9. 9.72 + 79 =
  10. 10.76 + 31 =
  11. 11.34 + 39 =
  12. 12.73 + 13 =
  13. 13.22 + 31 =
  14. 14.63 + 57 =
  15. 15.40 + 21 =
  16. 16.52 + 17 =
  17. 17.53 + 28 =
  18. 18.61 + 73 =
  19. 19.47 + 22 =
  20. 20.70 + 82 =
  21. 21.24 + 39 =
  22. 22.66 + 57 =
  23. 23.53 + 54 =
  24. 24.56 + 89 =
  25. 25.83 + 24 =
  26. 26.27 + 13 =
  27. 27.23 + 41 =
  28. 28.64 + 19 =
  29. 29.40 + 35 =
  30. 30.89 + 61 =
  31. 31.74 + 83 =
  32. 32.80 + 19 =
  33. 33.78 + 19 =
  34. 34.70 + 41 =
  35. 35.29 + 85 =
  36. 36.32 + 71 =
  37. 37.62 + 31 =
  38. 38.55 + 57 =
  39. 39.82 + 76 =
  40. 40.30 + 81 =

Answer key

  1. 80
  2. 157
  3. 78
  4. 80
  5. 93
  6. 123
  7. 55
  8. 81
  9. 151
  10. 107
  11. 73
  12. 86
  13. 53
  14. 120
  15. 61
  16. 69
  17. 81
  18. 134
  19. 69
  20. 152
  21. 63
  22. 123
  23. 107
  24. 145
  25. 107
  26. 40
  27. 64
  28. 83
  29. 75
  30. 150
  31. 157
  32. 99
  33. 97
  34. 111
  35. 114
  36. 103
  37. 93
  38. 112
  39. 158
  40. 111

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