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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 7 · 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. 1.45 + 42 =
  2. 2.42 + 47 =
  3. 3.31 + 29 =
  4. 4.22 + 21 =
  5. 5.41 + 81 =
  6. 6.22 + 82 =
  7. 7.67 + 43 =
  8. 8.66 + 31 =
  9. 9.78 + 32 =
  10. 10.87 + 21 =
  11. 11.83 + 52 =
  12. 12.77 + 73 =
  13. 13.69 + 18 =
  14. 14.33 + 73 =
  15. 15.25 + 16 =
  16. 16.52 + 31 =
  17. 17.51 + 53 =
  18. 18.46 + 59 =
  19. 19.39 + 54 =
  20. 20.81 + 38 =
  21. 21.80 + 76 =
  22. 22.44 + 27 =
  23. 23.61 + 39 =
  24. 24.31 + 81 =
  25. 25.81 + 12 =
  26. 26.57 + 15 =
  27. 27.23 + 54 =
  28. 28.78 + 51 =
  29. 29.40 + 31 =
  30. 30.27 + 61 =
  31. 31.36 + 46 =
  32. 32.69 + 81 =
  33. 33.50 + 58 =
  34. 34.80 + 24 =
  35. 35.51 + 34 =
  36. 36.49 + 23 =
  37. 37.26 + 51 =
  38. 38.84 + 64 =
  39. 39.85 + 16 =
  40. 40.27 + 14 =

Answer key

  1. 87
  2. 89
  3. 60
  4. 43
  5. 122
  6. 104
  7. 110
  8. 97
  9. 110
  10. 108
  11. 135
  12. 150
  13. 87
  14. 106
  15. 41
  16. 83
  17. 104
  18. 105
  19. 93
  20. 119
  21. 156
  22. 71
  23. 100
  24. 112
  25. 93
  26. 72
  27. 77
  28. 129
  29. 71
  30. 88
  31. 82
  32. 150
  33. 108
  34. 104
  35. 85
  36. 72
  37. 77
  38. 148
  39. 101
  40. 41

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