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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 323 · 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. 1.87 + 21 =
  2. 2.38 + 69 =
  3. 3.36 + 26 =
  4. 4.80 + 81 =
  5. 5.79 + 76 =
  6. 6.48 + 86 =
  7. 7.22 + 53 =
  8. 8.68 + 85 =
  9. 9.75 + 21 =
  10. 10.50 + 31 =
  11. 11.73 + 61 =
  12. 12.81 + 17 =
  13. 13.58 + 31 =
  14. 14.62 + 16 =
  15. 15.83 + 66 =
  16. 16.57 + 86 =
  17. 17.49 + 39 =
  18. 18.62 + 45 =
  19. 19.75 + 56 =
  20. 20.38 + 39 =
  21. 21.38 + 59 =
  22. 22.88 + 85 =
  23. 23.50 + 42 =
  24. 24.25 + 44 =
  25. 25.34 + 13 =
  26. 26.32 + 25 =
  27. 27.44 + 51 =
  28. 28.45 + 28 =
  29. 29.62 + 41 =
  30. 30.38 + 61 =
  31. 31.34 + 24 =
  32. 32.43 + 63 =
  33. 33.55 + 89 =
  34. 34.58 + 71 =
  35. 35.53 + 31 =
  36. 36.60 + 78 =
  37. 37.30 + 21 =
  38. 38.78 + 51 =
  39. 39.45 + 54 =
  40. 40.88 + 51 =

Answer key

  1. 108
  2. 107
  3. 62
  4. 161
  5. 155
  6. 134
  7. 75
  8. 153
  9. 96
  10. 81
  11. 134
  12. 98
  13. 89
  14. 78
  15. 149
  16. 143
  17. 88
  18. 107
  19. 131
  20. 77
  21. 97
  22. 173
  23. 92
  24. 69
  25. 47
  26. 57
  27. 95
  28. 73
  29. 103
  30. 99
  31. 58
  32. 106
  33. 144
  34. 129
  35. 84
  36. 138
  37. 51
  38. 129
  39. 99
  40. 139

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