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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 339 · 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 + 24 =
  2. 2.35 + 18 =
  3. 3.24 + 68 =
  4. 4.71 + 81 =
  5. 5.83 + 61 =
  6. 6.38 + 55 =
  7. 7.57 + 17 =
  8. 8.82 + 31 =
  9. 9.32 + 21 =
  10. 10.32 + 31 =
  11. 11.52 + 72 =
  12. 12.85 + 53 =
  13. 13.44 + 28 =
  14. 14.67 + 53 =
  15. 15.42 + 12 =
  16. 16.67 + 24 =
  17. 17.84 + 44 =
  18. 18.37 + 73 =
  19. 19.21 + 54 =
  20. 20.73 + 86 =
  21. 21.46 + 77 =
  22. 22.83 + 71 =
  23. 23.63 + 53 =
  24. 24.74 + 54 =
  25. 25.28 + 52 =
  26. 26.69 + 74 =
  27. 27.88 + 34 =
  28. 28.84 + 63 =
  29. 29.71 + 49 =
  30. 30.77 + 57 =
  31. 31.63 + 85 =
  32. 32.54 + 27 =
  33. 33.33 + 17 =
  34. 34.39 + 46 =
  35. 35.43 + 53 =
  36. 36.89 + 54 =
  37. 37.78 + 63 =
  38. 38.40 + 61 =
  39. 39.29 + 52 =
  40. 40.29 + 34 =

Answer key

  1. 45
  2. 53
  3. 92
  4. 152
  5. 144
  6. 93
  7. 74
  8. 113
  9. 53
  10. 63
  11. 124
  12. 138
  13. 72
  14. 120
  15. 54
  16. 91
  17. 128
  18. 110
  19. 75
  20. 159
  21. 123
  22. 154
  23. 116
  24. 128
  25. 80
  26. 143
  27. 122
  28. 147
  29. 120
  30. 134
  31. 148
  32. 81
  33. 50
  34. 85
  35. 96
  36. 143
  37. 141
  38. 101
  39. 81
  40. 63

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