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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 798 · 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. 1.66 + 33 =
  2. 2.55 + 29 =
  3. 3.29 + 14 =
  4. 4.39 + 16 =
  5. 5.58 + 81 =
  6. 6.72 + 71 =
  7. 7.78 + 63 =
  8. 8.35 + 14 =
  9. 9.84 + 52 =
  10. 10.65 + 81 =
  11. 11.76 + 13 =
  12. 12.22 + 84 =
  13. 13.63 + 47 =
  14. 14.39 + 45 =
  15. 15.38 + 29 =
  16. 16.25 + 74 =
  17. 17.47 + 61 =
  18. 18.27 + 67 =
  19. 19.85 + 33 =
  20. 20.86 + 26 =
  21. 21.41 + 74 =
  22. 22.58 + 34 =
  23. 23.33 + 52 =
  24. 24.31 + 39 =
  25. 25.62 + 18 =
  26. 26.42 + 76 =
  27. 27.57 + 39 =
  28. 28.72 + 29 =
  29. 29.47 + 78 =
  30. 30.69 + 16 =
  31. 31.25 + 79 =
  32. 32.69 + 43 =
  33. 33.66 + 49 =
  34. 34.63 + 71 =
  35. 35.56 + 12 =
  36. 36.56 + 49 =
  37. 37.76 + 15 =
  38. 38.71 + 58 =
  39. 39.30 + 59 =
  40. 40.62 + 58 =

Answer key

  1. 99
  2. 84
  3. 43
  4. 55
  5. 139
  6. 143
  7. 141
  8. 49
  9. 136
  10. 146
  11. 89
  12. 106
  13. 110
  14. 84
  15. 67
  16. 99
  17. 108
  18. 94
  19. 118
  20. 112
  21. 115
  22. 92
  23. 85
  24. 70
  25. 80
  26. 118
  27. 96
  28. 101
  29. 125
  30. 85
  31. 104
  32. 112
  33. 115
  34. 134
  35. 68
  36. 105
  37. 91
  38. 129
  39. 89
  40. 120

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