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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 403 · 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. 1.67 + 77 =
  2. 2.89 + 79 =
  3. 3.49 + 86 =
  4. 4.29 + 42 =
  5. 5.41 + 55 =
  6. 6.48 + 28 =
  7. 7.36 + 48 =
  8. 8.30 + 25 =
  9. 9.29 + 64 =
  10. 10.85 + 38 =
  11. 11.68 + 89 =
  12. 12.58 + 39 =
  13. 13.82 + 88 =
  14. 14.28 + 72 =
  15. 15.23 + 59 =
  16. 16.41 + 58 =
  17. 17.87 + 78 =
  18. 18.45 + 41 =
  19. 19.43 + 81 =
  20. 20.36 + 44 =
  21. 21.35 + 71 =
  22. 22.22 + 22 =
  23. 23.74 + 35 =
  24. 24.39 + 66 =
  25. 25.30 + 18 =
  26. 26.41 + 31 =
  27. 27.75 + 54 =
  28. 28.78 + 71 =
  29. 29.69 + 73 =
  30. 30.54 + 31 =
  31. 31.85 + 35 =
  32. 32.32 + 83 =
  33. 33.37 + 22 =
  34. 34.32 + 45 =
  35. 35.24 + 79 =
  36. 36.85 + 16 =
  37. 37.22 + 65 =
  38. 38.79 + 84 =
  39. 39.30 + 31 =
  40. 40.37 + 16 =

Answer key

  1. 144
  2. 168
  3. 135
  4. 71
  5. 96
  6. 76
  7. 84
  8. 55
  9. 93
  10. 123
  11. 157
  12. 97
  13. 170
  14. 100
  15. 82
  16. 99
  17. 165
  18. 86
  19. 124
  20. 80
  21. 106
  22. 44
  23. 109
  24. 105
  25. 48
  26. 72
  27. 129
  28. 149
  29. 142
  30. 85
  31. 120
  32. 115
  33. 59
  34. 77
  35. 103
  36. 101
  37. 87
  38. 163
  39. 61
  40. 53

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