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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 665 · 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. 1.31 + 39 =
  2. 2.49 + 87 =
  3. 3.76 + 27 =
  4. 4.78 + 71 =
  5. 5.75 + 72 =
  6. 6.59 + 51 =
  7. 7.72 + 25 =
  8. 8.40 + 31 =
  9. 9.75 + 22 =
  10. 10.28 + 24 =
  11. 11.87 + 72 =
  12. 12.48 + 71 =
  13. 13.51 + 14 =
  14. 14.32 + 32 =
  15. 15.24 + 75 =
  16. 16.34 + 34 =
  17. 17.37 + 63 =
  18. 18.39 + 21 =
  19. 19.50 + 45 =
  20. 20.72 + 24 =
  21. 21.23 + 52 =
  22. 22.68 + 15 =
  23. 23.84 + 21 =
  24. 24.85 + 88 =
  25. 25.51 + 17 =
  26. 26.21 + 19 =
  27. 27.45 + 54 =
  28. 28.65 + 22 =
  29. 29.47 + 28 =
  30. 30.87 + 25 =
  31. 31.24 + 29 =
  32. 32.34 + 89 =
  33. 33.24 + 51 =
  34. 34.47 + 75 =
  35. 35.51 + 58 =
  36. 36.24 + 52 =
  37. 37.32 + 78 =
  38. 38.62 + 68 =
  39. 39.61 + 43 =
  40. 40.45 + 18 =

Answer key

  1. 70
  2. 136
  3. 103
  4. 149
  5. 147
  6. 110
  7. 97
  8. 71
  9. 97
  10. 52
  11. 159
  12. 119
  13. 65
  14. 64
  15. 99
  16. 68
  17. 100
  18. 60
  19. 95
  20. 96
  21. 75
  22. 83
  23. 105
  24. 173
  25. 68
  26. 40
  27. 99
  28. 87
  29. 75
  30. 112
  31. 53
  32. 123
  33. 75
  34. 122
  35. 109
  36. 76
  37. 110
  38. 130
  39. 104
  40. 63

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