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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 623 · 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. 1.74 + 77 =
  2. 2.48 + 21 =
  3. 3.79 + 15 =
  4. 4.62 + 78 =
  5. 5.53 + 41 =
  6. 6.74 + 31 =
  7. 7.39 + 21 =
  8. 8.37 + 38 =
  9. 9.66 + 81 =
  10. 10.76 + 15 =
  11. 11.41 + 55 =
  12. 12.40 + 87 =
  13. 13.30 + 17 =
  14. 14.42 + 67 =
  15. 15.35 + 31 =
  16. 16.88 + 67 =
  17. 17.53 + 19 =
  18. 18.22 + 74 =
  19. 19.27 + 18 =
  20. 20.59 + 72 =
  21. 21.86 + 41 =
  22. 22.39 + 34 =
  23. 23.65 + 47 =
  24. 24.46 + 52 =
  25. 25.83 + 28 =
  26. 26.23 + 23 =
  27. 27.52 + 38 =
  28. 28.62 + 31 =
  29. 29.51 + 66 =
  30. 30.55 + 71 =
  31. 31.36 + 85 =
  32. 32.72 + 22 =
  33. 33.73 + 33 =
  34. 34.33 + 13 =
  35. 35.44 + 37 =
  36. 36.76 + 43 =
  37. 37.68 + 23 =
  38. 38.81 + 87 =
  39. 39.69 + 69 =
  40. 40.77 + 46 =

Answer key

  1. 151
  2. 69
  3. 94
  4. 140
  5. 94
  6. 105
  7. 60
  8. 75
  9. 147
  10. 91
  11. 96
  12. 127
  13. 47
  14. 109
  15. 66
  16. 155
  17. 72
  18. 96
  19. 45
  20. 131
  21. 127
  22. 73
  23. 112
  24. 98
  25. 111
  26. 46
  27. 90
  28. 93
  29. 117
  30. 126
  31. 121
  32. 94
  33. 106
  34. 46
  35. 81
  36. 119
  37. 91
  38. 168
  39. 138
  40. 123

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