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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 890 · 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. 1.66 + 69 =
  2. 2.59 + 74 =
  3. 3.63 + 54 =
  4. 4.29 + 18 =
  5. 5.55 + 26 =
  6. 6.67 + 49 =
  7. 7.25 + 31 =
  8. 8.62 + 81 =
  9. 9.30 + 21 =
  10. 10.70 + 22 =
  11. 11.29 + 13 =
  12. 12.77 + 73 =
  13. 13.73 + 42 =
  14. 14.55 + 89 =
  15. 15.84 + 59 =
  16. 16.47 + 87 =
  17. 17.54 + 73 =
  18. 18.69 + 64 =
  19. 19.80 + 13 =
  20. 20.55 + 82 =
  21. 21.63 + 41 =
  22. 22.27 + 47 =
  23. 23.25 + 62 =
  24. 24.31 + 85 =
  25. 25.41 + 16 =
  26. 26.32 + 29 =
  27. 27.37 + 14 =
  28. 28.66 + 88 =
  29. 29.84 + 27 =
  30. 30.76 + 37 =
  31. 31.63 + 87 =
  32. 32.56 + 23 =
  33. 33.23 + 77 =
  34. 34.69 + 21 =
  35. 35.61 + 88 =
  36. 36.58 + 25 =
  37. 37.44 + 25 =
  38. 38.29 + 71 =
  39. 39.82 + 16 =
  40. 40.53 + 75 =

Answer key

  1. 135
  2. 133
  3. 117
  4. 47
  5. 81
  6. 116
  7. 56
  8. 143
  9. 51
  10. 92
  11. 42
  12. 150
  13. 115
  14. 144
  15. 143
  16. 134
  17. 127
  18. 133
  19. 93
  20. 137
  21. 104
  22. 74
  23. 87
  24. 116
  25. 57
  26. 61
  27. 51
  28. 154
  29. 111
  30. 113
  31. 150
  32. 79
  33. 100
  34. 90
  35. 149
  36. 83
  37. 69
  38. 100
  39. 98
  40. 128

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