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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 75 · 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. 1.52 + 55 =
  2. 2.71 + 74 =
  3. 3.23 + 65 =
  4. 4.53 + 87 =
  5. 5.32 + 76 =
  6. 6.83 + 56 =
  7. 7.61 + 42 =
  8. 8.23 + 25 =
  9. 9.86 + 61 =
  10. 10.28 + 13 =
  11. 11.28 + 53 =
  12. 12.77 + 73 =
  13. 13.88 + 78 =
  14. 14.31 + 43 =
  15. 15.89 + 67 =
  16. 16.52 + 63 =
  17. 17.36 + 16 =
  18. 18.60 + 88 =
  19. 19.79 + 22 =
  20. 20.28 + 44 =
  21. 21.89 + 12 =
  22. 22.76 + 16 =
  23. 23.26 + 41 =
  24. 24.40 + 27 =
  25. 25.67 + 71 =
  26. 26.50 + 81 =
  27. 27.38 + 57 =
  28. 28.41 + 51 =
  29. 29.25 + 74 =
  30. 30.77 + 72 =
  31. 31.61 + 14 =
  32. 32.78 + 15 =
  33. 33.40 + 68 =
  34. 34.31 + 33 =
  35. 35.26 + 86 =
  36. 36.76 + 85 =
  37. 37.31 + 44 =
  38. 38.75 + 54 =
  39. 39.44 + 31 =
  40. 40.53 + 56 =

Answer key

  1. 107
  2. 145
  3. 88
  4. 140
  5. 108
  6. 139
  7. 103
  8. 48
  9. 147
  10. 41
  11. 81
  12. 150
  13. 166
  14. 74
  15. 156
  16. 115
  17. 52
  18. 148
  19. 101
  20. 72
  21. 101
  22. 92
  23. 67
  24. 67
  25. 138
  26. 131
  27. 95
  28. 92
  29. 99
  30. 149
  31. 75
  32. 93
  33. 108
  34. 64
  35. 112
  36. 161
  37. 75
  38. 129
  39. 75
  40. 109

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