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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 880 · 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. 1.49 + 14 =
  2. 2.52 + 45 =
  3. 3.21 + 32 =
  4. 4.55 + 83 =
  5. 5.55 + 78 =
  6. 6.70 + 63 =
  7. 7.89 + 65 =
  8. 8.57 + 41 =
  9. 9.54 + 41 =
  10. 10.61 + 22 =
  11. 11.65 + 51 =
  12. 12.51 + 27 =
  13. 13.78 + 14 =
  14. 14.32 + 29 =
  15. 15.81 + 45 =
  16. 16.27 + 76 =
  17. 17.37 + 37 =
  18. 18.76 + 26 =
  19. 19.88 + 22 =
  20. 20.80 + 86 =
  21. 21.39 + 58 =
  22. 22.77 + 72 =
  23. 23.69 + 16 =
  24. 24.23 + 12 =
  25. 25.88 + 52 =
  26. 26.67 + 58 =
  27. 27.51 + 79 =
  28. 28.65 + 81 =
  29. 29.45 + 62 =
  30. 30.68 + 54 =
  31. 31.85 + 31 =
  32. 32.46 + 55 =
  33. 33.42 + 67 =
  34. 34.68 + 79 =
  35. 35.38 + 81 =
  36. 36.62 + 38 =
  37. 37.76 + 49 =
  38. 38.89 + 84 =
  39. 39.76 + 29 =
  40. 40.42 + 14 =

Answer key

  1. 63
  2. 97
  3. 53
  4. 138
  5. 133
  6. 133
  7. 154
  8. 98
  9. 95
  10. 83
  11. 116
  12. 78
  13. 92
  14. 61
  15. 126
  16. 103
  17. 74
  18. 102
  19. 110
  20. 166
  21. 97
  22. 149
  23. 85
  24. 35
  25. 140
  26. 125
  27. 130
  28. 146
  29. 107
  30. 122
  31. 116
  32. 101
  33. 109
  34. 147
  35. 119
  36. 100
  37. 125
  38. 173
  39. 105
  40. 56

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