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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 380 · 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. 1.79 + 39 =
  2. 2.40 + 82 =
  3. 3.30 + 19 =
  4. 4.81 + 21 =
  5. 5.21 + 56 =
  6. 6.88 + 27 =
  7. 7.81 + 57 =
  8. 8.82 + 39 =
  9. 9.33 + 28 =
  10. 10.23 + 29 =
  11. 11.66 + 82 =
  12. 12.80 + 86 =
  13. 13.72 + 74 =
  14. 14.49 + 39 =
  15. 15.44 + 62 =
  16. 16.25 + 13 =
  17. 17.59 + 83 =
  18. 18.60 + 63 =
  19. 19.78 + 78 =
  20. 20.87 + 21 =
  21. 21.22 + 61 =
  22. 22.48 + 49 =
  23. 23.32 + 42 =
  24. 24.48 + 52 =
  25. 25.23 + 52 =
  26. 26.52 + 88 =
  27. 27.37 + 53 =
  28. 28.53 + 66 =
  29. 29.27 + 31 =
  30. 30.82 + 74 =
  31. 31.67 + 72 =
  32. 32.63 + 87 =
  33. 33.68 + 23 =
  34. 34.29 + 51 =
  35. 35.49 + 14 =
  36. 36.21 + 86 =
  37. 37.64 + 19 =
  38. 38.67 + 38 =
  39. 39.30 + 35 =
  40. 40.30 + 63 =

Answer key

  1. 118
  2. 122
  3. 49
  4. 102
  5. 77
  6. 115
  7. 138
  8. 121
  9. 61
  10. 52
  11. 148
  12. 166
  13. 146
  14. 88
  15. 106
  16. 38
  17. 142
  18. 123
  19. 156
  20. 108
  21. 83
  22. 97
  23. 74
  24. 100
  25. 75
  26. 140
  27. 90
  28. 119
  29. 58
  30. 156
  31. 139
  32. 150
  33. 91
  34. 80
  35. 63
  36. 107
  37. 83
  38. 105
  39. 65
  40. 93

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