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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 508 · 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. 1.27 + 21 =
  2. 2.31 + 68 =
  3. 3.68 + 32 =
  4. 4.24 + 41 =
  5. 5.72 + 54 =
  6. 6.35 + 49 =
  7. 7.34 + 71 =
  8. 8.70 + 67 =
  9. 9.76 + 66 =
  10. 10.87 + 61 =
  11. 11.82 + 36 =
  12. 12.37 + 34 =
  13. 13.79 + 71 =
  14. 14.61 + 25 =
  15. 15.86 + 72 =
  16. 16.55 + 51 =
  17. 17.40 + 56 =
  18. 18.59 + 72 =
  19. 19.30 + 21 =
  20. 20.33 + 18 =
  21. 21.26 + 41 =
  22. 22.70 + 42 =
  23. 23.33 + 17 =
  24. 24.30 + 49 =
  25. 25.67 + 61 =
  26. 26.42 + 26 =
  27. 27.84 + 81 =
  28. 28.84 + 28 =
  29. 29.28 + 66 =
  30. 30.77 + 71 =
  31. 31.37 + 42 =
  32. 32.37 + 84 =
  33. 33.39 + 53 =
  34. 34.66 + 81 =
  35. 35.27 + 15 =
  36. 36.80 + 81 =
  37. 37.26 + 81 =
  38. 38.23 + 56 =
  39. 39.56 + 44 =
  40. 40.72 + 86 =

Answer key

  1. 48
  2. 99
  3. 100
  4. 65
  5. 126
  6. 84
  7. 105
  8. 137
  9. 142
  10. 148
  11. 118
  12. 71
  13. 150
  14. 86
  15. 158
  16. 106
  17. 96
  18. 131
  19. 51
  20. 51
  21. 67
  22. 112
  23. 50
  24. 79
  25. 128
  26. 68
  27. 165
  28. 112
  29. 94
  30. 148
  31. 79
  32. 121
  33. 92
  34. 147
  35. 42
  36. 161
  37. 107
  38. 79
  39. 100
  40. 158

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