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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 664 · 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. 1.21 + 39 =
  2. 2.54 + 41 =
  3. 3.76 + 55 =
  4. 4.30 + 27 =
  5. 5.55 + 32 =
  6. 6.83 + 32 =
  7. 7.30 + 41 =
  8. 8.70 + 68 =
  9. 9.58 + 79 =
  10. 10.87 + 75 =
  11. 11.44 + 87 =
  12. 12.82 + 67 =
  13. 13.56 + 68 =
  14. 14.66 + 31 =
  15. 15.28 + 12 =
  16. 16.50 + 88 =
  17. 17.24 + 81 =
  18. 18.86 + 54 =
  19. 19.29 + 89 =
  20. 20.52 + 31 =
  21. 21.85 + 33 =
  22. 22.40 + 29 =
  23. 23.55 + 76 =
  24. 24.82 + 37 =
  25. 25.43 + 85 =
  26. 26.85 + 12 =
  27. 27.78 + 23 =
  28. 28.61 + 15 =
  29. 29.39 + 81 =
  30. 30.41 + 38 =
  31. 31.42 + 57 =
  32. 32.25 + 21 =
  33. 33.23 + 72 =
  34. 34.51 + 59 =
  35. 35.52 + 78 =
  36. 36.73 + 31 =
  37. 37.82 + 75 =
  38. 38.75 + 61 =
  39. 39.22 + 27 =
  40. 40.38 + 19 =

Answer key

  1. 60
  2. 95
  3. 131
  4. 57
  5. 87
  6. 115
  7. 71
  8. 138
  9. 137
  10. 162
  11. 131
  12. 149
  13. 124
  14. 97
  15. 40
  16. 138
  17. 105
  18. 140
  19. 118
  20. 83
  21. 118
  22. 69
  23. 131
  24. 119
  25. 128
  26. 97
  27. 101
  28. 76
  29. 120
  30. 79
  31. 99
  32. 46
  33. 95
  34. 110
  35. 130
  36. 104
  37. 157
  38. 136
  39. 49
  40. 57

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