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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 959 · 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. 1.37 + 78 =
  2. 2.86 + 14 =
  3. 3.29 + 39 =
  4. 4.28 + 49 =
  5. 5.33 + 31 =
  6. 6.34 + 76 =
  7. 7.74 + 55 =
  8. 8.84 + 37 =
  9. 9.25 + 61 =
  10. 10.63 + 58 =
  11. 11.65 + 74 =
  12. 12.29 + 46 =
  13. 13.44 + 31 =
  14. 14.61 + 71 =
  15. 15.47 + 58 =
  16. 16.78 + 16 =
  17. 17.79 + 71 =
  18. 18.61 + 18 =
  19. 19.63 + 55 =
  20. 20.37 + 84 =
  21. 21.31 + 75 =
  22. 22.38 + 51 =
  23. 23.83 + 23 =
  24. 24.47 + 72 =
  25. 25.21 + 16 =
  26. 26.48 + 78 =
  27. 27.53 + 21 =
  28. 28.33 + 61 =
  29. 29.40 + 56 =
  30. 30.41 + 36 =
  31. 31.55 + 74 =
  32. 32.21 + 31 =
  33. 33.39 + 66 =
  34. 34.68 + 35 =
  35. 35.63 + 27 =
  36. 36.21 + 86 =
  37. 37.83 + 17 =
  38. 38.29 + 89 =
  39. 39.52 + 83 =
  40. 40.87 + 15 =

Answer key

  1. 115
  2. 100
  3. 68
  4. 77
  5. 64
  6. 110
  7. 129
  8. 121
  9. 86
  10. 121
  11. 139
  12. 75
  13. 75
  14. 132
  15. 105
  16. 94
  17. 150
  18. 79
  19. 118
  20. 121
  21. 106
  22. 89
  23. 106
  24. 119
  25. 37
  26. 126
  27. 74
  28. 94
  29. 96
  30. 77
  31. 129
  32. 52
  33. 105
  34. 103
  35. 90
  36. 107
  37. 100
  38. 118
  39. 135
  40. 102

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