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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 10 · 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. 1.70 + 77 =
  2. 2.76 + 68 =
  3. 3.29 + 79 =
  4. 4.53 + 55 =
  5. 5.51 + 88 =
  6. 6.75 + 81 =
  7. 7.43 + 44 =
  8. 8.28 + 62 =
  9. 9.77 + 64 =
  10. 10.27 + 42 =
  11. 11.42 + 35 =
  12. 12.78 + 51 =
  13. 13.60 + 63 =
  14. 14.33 + 55 =
  15. 15.56 + 51 =
  16. 16.50 + 25 =
  17. 17.21 + 46 =
  18. 18.67 + 54 =
  19. 19.47 + 78 =
  20. 20.36 + 17 =
  21. 21.54 + 81 =
  22. 22.23 + 49 =
  23. 23.75 + 18 =
  24. 24.60 + 81 =
  25. 25.81 + 63 =
  26. 26.30 + 66 =
  27. 27.34 + 35 =
  28. 28.39 + 48 =
  29. 29.73 + 17 =
  30. 30.40 + 51 =
  31. 31.68 + 71 =
  32. 32.77 + 17 =
  33. 33.64 + 89 =
  34. 34.84 + 62 =
  35. 35.66 + 57 =
  36. 36.54 + 78 =
  37. 37.82 + 28 =
  38. 38.58 + 28 =
  39. 39.41 + 71 =
  40. 40.34 + 63 =

Answer key

  1. 147
  2. 144
  3. 108
  4. 108
  5. 139
  6. 156
  7. 87
  8. 90
  9. 141
  10. 69
  11. 77
  12. 129
  13. 123
  14. 88
  15. 107
  16. 75
  17. 67
  18. 121
  19. 125
  20. 53
  21. 135
  22. 72
  23. 93
  24. 141
  25. 144
  26. 96
  27. 69
  28. 87
  29. 90
  30. 91
  31. 139
  32. 94
  33. 153
  34. 146
  35. 123
  36. 132
  37. 110
  38. 86
  39. 112
  40. 97

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