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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 820 · 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. 1.25 + 79 =
  2. 2.21 + 55 =
  3. 3.75 + 66 =
  4. 4.30 + 79 =
  5. 5.32 + 41 =
  6. 6.37 + 66 =
  7. 7.58 + 33 =
  8. 8.79 + 74 =
  9. 9.46 + 31 =
  10. 10.59 + 21 =
  11. 11.23 + 54 =
  12. 12.58 + 54 =
  13. 13.45 + 21 =
  14. 14.72 + 47 =
  15. 15.64 + 81 =
  16. 16.82 + 31 =
  17. 17.77 + 82 =
  18. 18.31 + 61 =
  19. 19.29 + 19 =
  20. 20.54 + 43 =
  21. 21.61 + 68 =
  22. 22.75 + 17 =
  23. 23.31 + 29 =
  24. 24.82 + 47 =
  25. 25.32 + 57 =
  26. 26.70 + 33 =
  27. 27.85 + 12 =
  28. 28.86 + 42 =
  29. 29.54 + 71 =
  30. 30.24 + 19 =
  31. 31.33 + 12 =
  32. 32.79 + 82 =
  33. 33.24 + 16 =
  34. 34.28 + 53 =
  35. 35.36 + 21 =
  36. 36.41 + 63 =
  37. 37.27 + 42 =
  38. 38.54 + 31 =
  39. 39.77 + 63 =
  40. 40.53 + 15 =

Answer key

  1. 104
  2. 76
  3. 141
  4. 109
  5. 73
  6. 103
  7. 91
  8. 153
  9. 77
  10. 80
  11. 77
  12. 112
  13. 66
  14. 119
  15. 145
  16. 113
  17. 159
  18. 92
  19. 48
  20. 97
  21. 129
  22. 92
  23. 60
  24. 129
  25. 89
  26. 103
  27. 97
  28. 128
  29. 125
  30. 43
  31. 45
  32. 161
  33. 40
  34. 81
  35. 57
  36. 104
  37. 69
  38. 85
  39. 140
  40. 68

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