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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 389 · 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. 1.75 + 81 =
  2. 2.25 + 58 =
  3. 3.32 + 73 =
  4. 4.28 + 27 =
  5. 5.46 + 74 =
  6. 6.69 + 88 =
  7. 7.23 + 63 =
  8. 8.59 + 41 =
  9. 9.31 + 27 =
  10. 10.34 + 21 =
  11. 11.85 + 25 =
  12. 12.83 + 13 =
  13. 13.41 + 26 =
  14. 14.86 + 14 =
  15. 15.63 + 42 =
  16. 16.82 + 65 =
  17. 17.43 + 28 =
  18. 18.34 + 81 =
  19. 19.51 + 17 =
  20. 20.80 + 76 =
  21. 21.75 + 49 =
  22. 22.50 + 58 =
  23. 23.78 + 21 =
  24. 24.31 + 51 =
  25. 25.46 + 25 =
  26. 26.86 + 12 =
  27. 27.67 + 64 =
  28. 28.57 + 24 =
  29. 29.46 + 17 =
  30. 30.34 + 77 =
  31. 31.47 + 41 =
  32. 32.69 + 43 =
  33. 33.30 + 62 =
  34. 34.89 + 46 =
  35. 35.57 + 43 =
  36. 36.38 + 89 =
  37. 37.82 + 59 =
  38. 38.84 + 21 =
  39. 39.21 + 65 =
  40. 40.80 + 77 =

Answer key

  1. 156
  2. 83
  3. 105
  4. 55
  5. 120
  6. 157
  7. 86
  8. 100
  9. 58
  10. 55
  11. 110
  12. 96
  13. 67
  14. 100
  15. 105
  16. 147
  17. 71
  18. 115
  19. 68
  20. 156
  21. 124
  22. 108
  23. 99
  24. 82
  25. 71
  26. 98
  27. 131
  28. 81
  29. 63
  30. 111
  31. 88
  32. 112
  33. 92
  34. 135
  35. 100
  36. 127
  37. 141
  38. 105
  39. 86
  40. 157

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