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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 509 · 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. 1.86 + 39 =
  2. 2.71 + 78 =
  3. 3.78 + 62 =
  4. 4.32 + 44 =
  5. 5.41 + 62 =
  6. 6.78 + 71 =
  7. 7.78 + 31 =
  8. 8.45 + 61 =
  9. 9.32 + 76 =
  10. 10.48 + 78 =
  11. 11.66 + 47 =
  12. 12.61 + 88 =
  13. 13.21 + 29 =
  14. 14.79 + 42 =
  15. 15.42 + 38 =
  16. 16.42 + 27 =
  17. 17.64 + 88 =
  18. 18.29 + 31 =
  19. 19.22 + 75 =
  20. 20.28 + 51 =
  21. 21.22 + 18 =
  22. 22.39 + 32 =
  23. 23.52 + 16 =
  24. 24.70 + 31 =
  25. 25.57 + 76 =
  26. 26.35 + 24 =
  27. 27.26 + 79 =
  28. 28.30 + 86 =
  29. 29.35 + 65 =
  30. 30.28 + 14 =
  31. 31.63 + 72 =
  32. 32.83 + 77 =
  33. 33.36 + 82 =
  34. 34.88 + 29 =
  35. 35.53 + 62 =
  36. 36.41 + 71 =
  37. 37.87 + 61 =
  38. 38.82 + 74 =
  39. 39.48 + 52 =
  40. 40.37 + 24 =

Answer key

  1. 125
  2. 149
  3. 140
  4. 76
  5. 103
  6. 149
  7. 109
  8. 106
  9. 108
  10. 126
  11. 113
  12. 149
  13. 50
  14. 121
  15. 80
  16. 69
  17. 152
  18. 60
  19. 97
  20. 79
  21. 40
  22. 71
  23. 68
  24. 101
  25. 133
  26. 59
  27. 105
  28. 116
  29. 100
  30. 42
  31. 135
  32. 160
  33. 118
  34. 117
  35. 115
  36. 112
  37. 148
  38. 156
  39. 100
  40. 61

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