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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 471 · 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. 1.34 + 78 =
  2. 2.88 + 24 =
  3. 3.63 + 23 =
  4. 4.37 + 21 =
  5. 5.54 + 18 =
  6. 6.44 + 31 =
  7. 7.51 + 26 =
  8. 8.42 + 31 =
  9. 9.56 + 74 =
  10. 10.75 + 85 =
  11. 11.78 + 53 =
  12. 12.60 + 48 =
  13. 13.31 + 71 =
  14. 14.37 + 78 =
  15. 15.61 + 12 =
  16. 16.80 + 18 =
  17. 17.60 + 14 =
  18. 18.40 + 76 =
  19. 19.48 + 78 =
  20. 20.24 + 53 =
  21. 21.24 + 84 =
  22. 22.61 + 33 =
  23. 23.38 + 81 =
  24. 24.57 + 64 =
  25. 25.49 + 26 =
  26. 26.61 + 51 =
  27. 27.43 + 64 =
  28. 28.83 + 15 =
  29. 29.69 + 71 =
  30. 30.65 + 74 =
  31. 31.65 + 35 =
  32. 32.73 + 75 =
  33. 33.40 + 63 =
  34. 34.81 + 71 =
  35. 35.81 + 15 =
  36. 36.36 + 41 =
  37. 37.46 + 71 =
  38. 38.42 + 83 =
  39. 39.78 + 34 =
  40. 40.70 + 79 =

Answer key

  1. 112
  2. 112
  3. 86
  4. 58
  5. 72
  6. 75
  7. 77
  8. 73
  9. 130
  10. 160
  11. 131
  12. 108
  13. 102
  14. 115
  15. 73
  16. 98
  17. 74
  18. 116
  19. 126
  20. 77
  21. 108
  22. 94
  23. 119
  24. 121
  25. 75
  26. 112
  27. 107
  28. 98
  29. 140
  30. 139
  31. 100
  32. 148
  33. 103
  34. 152
  35. 96
  36. 77
  37. 117
  38. 125
  39. 112
  40. 149

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