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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 420 · 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. 1.51 + 59 =
  2. 2.68 + 87 =
  3. 3.28 + 53 =
  4. 4.89 + 69 =
  5. 5.82 + 21 =
  6. 6.59 + 38 =
  7. 7.39 + 69 =
  8. 8.32 + 34 =
  9. 9.43 + 67 =
  10. 10.70 + 13 =
  11. 11.59 + 23 =
  12. 12.43 + 73 =
  13. 13.80 + 86 =
  14. 14.72 + 53 =
  15. 15.53 + 87 =
  16. 16.68 + 21 =
  17. 17.86 + 38 =
  18. 18.23 + 25 =
  19. 19.89 + 31 =
  20. 20.52 + 65 =
  21. 21.61 + 65 =
  22. 22.73 + 63 =
  23. 23.40 + 63 =
  24. 24.70 + 41 =
  25. 25.37 + 12 =
  26. 26.65 + 21 =
  27. 27.34 + 64 =
  28. 28.78 + 12 =
  29. 29.45 + 41 =
  30. 30.84 + 47 =
  31. 31.50 + 41 =
  32. 32.27 + 31 =
  33. 33.88 + 51 =
  34. 34.85 + 14 =
  35. 35.47 + 44 =
  36. 36.47 + 82 =
  37. 37.72 + 23 =
  38. 38.61 + 32 =
  39. 39.25 + 77 =
  40. 40.39 + 25 =

Answer key

  1. 110
  2. 155
  3. 81
  4. 158
  5. 103
  6. 97
  7. 108
  8. 66
  9. 110
  10. 83
  11. 82
  12. 116
  13. 166
  14. 125
  15. 140
  16. 89
  17. 124
  18. 48
  19. 120
  20. 117
  21. 126
  22. 136
  23. 103
  24. 111
  25. 49
  26. 86
  27. 98
  28. 90
  29. 86
  30. 131
  31. 91
  32. 58
  33. 139
  34. 99
  35. 91
  36. 129
  37. 95
  38. 93
  39. 102
  40. 64

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