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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 789 · 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. 1.63 + 46 =
  2. 2.22 + 33 =
  3. 3.70 + 56 =
  4. 4.89 + 77 =
  5. 5.56 + 16 =
  6. 6.88 + 71 =
  7. 7.65 + 21 =
  8. 8.56 + 72 =
  9. 9.36 + 77 =
  10. 10.41 + 51 =
  11. 11.71 + 19 =
  12. 12.28 + 88 =
  13. 13.33 + 58 =
  14. 14.52 + 21 =
  15. 15.36 + 68 =
  16. 16.46 + 76 =
  17. 17.73 + 51 =
  18. 18.62 + 31 =
  19. 19.24 + 24 =
  20. 20.24 + 26 =
  21. 21.44 + 61 =
  22. 22.42 + 36 =
  23. 23.55 + 82 =
  24. 24.26 + 26 =
  25. 25.64 + 74 =
  26. 26.39 + 25 =
  27. 27.49 + 56 =
  28. 28.81 + 26 =
  29. 29.78 + 84 =
  30. 30.36 + 12 =
  31. 31.36 + 85 =
  32. 32.34 + 34 =
  33. 33.83 + 24 =
  34. 34.34 + 39 =
  35. 35.78 + 38 =
  36. 36.33 + 13 =
  37. 37.31 + 74 =
  38. 38.71 + 85 =
  39. 39.39 + 65 =
  40. 40.75 + 72 =

Answer key

  1. 109
  2. 55
  3. 126
  4. 166
  5. 72
  6. 159
  7. 86
  8. 128
  9. 113
  10. 92
  11. 90
  12. 116
  13. 91
  14. 73
  15. 104
  16. 122
  17. 124
  18. 93
  19. 48
  20. 50
  21. 105
  22. 78
  23. 137
  24. 52
  25. 138
  26. 64
  27. 105
  28. 107
  29. 162
  30. 48
  31. 121
  32. 68
  33. 107
  34. 73
  35. 116
  36. 46
  37. 105
  38. 156
  39. 104
  40. 147

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