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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 750 · 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. 1.81 + 17 =
  2. 2.35 + 21 =
  3. 3.53 + 55 =
  4. 4.21 + 86 =
  5. 5.65 + 82 =
  6. 6.29 + 44 =
  7. 7.59 + 66 =
  8. 8.57 + 21 =
  9. 9.47 + 63 =
  10. 10.57 + 23 =
  11. 11.74 + 76 =
  12. 12.65 + 12 =
  13. 13.84 + 35 =
  14. 14.44 + 67 =
  15. 15.61 + 39 =
  16. 16.31 + 21 =
  17. 17.36 + 55 =
  18. 18.25 + 66 =
  19. 19.51 + 13 =
  20. 20.62 + 18 =
  21. 21.28 + 19 =
  22. 22.74 + 55 =
  23. 23.58 + 71 =
  24. 24.52 + 39 =
  25. 25.78 + 26 =
  26. 26.32 + 41 =
  27. 27.64 + 13 =
  28. 28.72 + 19 =
  29. 29.24 + 68 =
  30. 30.63 + 79 =
  31. 31.83 + 19 =
  32. 32.83 + 15 =
  33. 33.55 + 77 =
  34. 34.36 + 25 =
  35. 35.45 + 81 =
  36. 36.71 + 33 =
  37. 37.89 + 57 =
  38. 38.69 + 61 =
  39. 39.38 + 21 =
  40. 40.38 + 86 =

Answer key

  1. 98
  2. 56
  3. 108
  4. 107
  5. 147
  6. 73
  7. 125
  8. 78
  9. 110
  10. 80
  11. 150
  12. 77
  13. 119
  14. 111
  15. 100
  16. 52
  17. 91
  18. 91
  19. 64
  20. 80
  21. 47
  22. 129
  23. 129
  24. 91
  25. 104
  26. 73
  27. 77
  28. 91
  29. 92
  30. 142
  31. 102
  32. 98
  33. 132
  34. 61
  35. 126
  36. 104
  37. 146
  38. 130
  39. 59
  40. 124

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