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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 101 · 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. 1.68 + 21 =
  2. 2.34 + 68 =
  3. 3.31 + 19 =
  4. 4.37 + 22 =
  5. 5.43 + 26 =
  6. 6.64 + 25 =
  7. 7.57 + 31 =
  8. 8.46 + 46 =
  9. 9.68 + 81 =
  10. 10.24 + 67 =
  11. 11.77 + 23 =
  12. 12.66 + 33 =
  13. 13.54 + 54 =
  14. 14.86 + 82 =
  15. 15.48 + 43 =
  16. 16.74 + 45 =
  17. 17.27 + 85 =
  18. 18.44 + 14 =
  19. 19.31 + 43 =
  20. 20.41 + 29 =
  21. 21.37 + 37 =
  22. 22.86 + 75 =
  23. 23.35 + 81 =
  24. 24.43 + 89 =
  25. 25.39 + 51 =
  26. 26.27 + 21 =
  27. 27.31 + 39 =
  28. 28.38 + 81 =
  29. 29.59 + 21 =
  30. 30.67 + 52 =
  31. 31.30 + 23 =
  32. 32.56 + 65 =
  33. 33.65 + 62 =
  34. 34.73 + 12 =
  35. 35.86 + 23 =
  36. 36.56 + 82 =
  37. 37.86 + 59 =
  38. 38.40 + 14 =
  39. 39.86 + 37 =
  40. 40.44 + 76 =

Answer key

  1. 89
  2. 102
  3. 50
  4. 59
  5. 69
  6. 89
  7. 88
  8. 92
  9. 149
  10. 91
  11. 100
  12. 99
  13. 108
  14. 168
  15. 91
  16. 119
  17. 112
  18. 58
  19. 74
  20. 70
  21. 74
  22. 161
  23. 116
  24. 132
  25. 90
  26. 48
  27. 70
  28. 119
  29. 80
  30. 119
  31. 53
  32. 121
  33. 127
  34. 85
  35. 109
  36. 138
  37. 145
  38. 54
  39. 123
  40. 120

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