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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 570 · 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. 1.45 + 13 =
  2. 2.27 + 29 =
  3. 3.24 + 55 =
  4. 4.65 + 46 =
  5. 5.63 + 19 =
  6. 6.65 + 68 =
  7. 7.80 + 61 =
  8. 8.77 + 17 =
  9. 9.46 + 63 =
  10. 10.35 + 52 =
  11. 11.43 + 47 =
  12. 12.68 + 21 =
  13. 13.49 + 42 =
  14. 14.25 + 39 =
  15. 15.52 + 26 =
  16. 16.49 + 78 =
  17. 17.35 + 21 =
  18. 18.81 + 35 =
  19. 19.55 + 63 =
  20. 20.31 + 55 =
  21. 21.40 + 33 =
  22. 22.27 + 41 =
  23. 23.49 + 53 =
  24. 24.33 + 39 =
  25. 25.26 + 74 =
  26. 26.34 + 84 =
  27. 27.56 + 13 =
  28. 28.26 + 79 =
  29. 29.40 + 32 =
  30. 30.34 + 16 =
  31. 31.39 + 85 =
  32. 32.61 + 75 =
  33. 33.52 + 49 =
  34. 34.31 + 61 =
  35. 35.67 + 58 =
  36. 36.41 + 28 =
  37. 37.23 + 82 =
  38. 38.37 + 82 =
  39. 39.23 + 74 =
  40. 40.30 + 81 =

Answer key

  1. 58
  2. 56
  3. 79
  4. 111
  5. 82
  6. 133
  7. 141
  8. 94
  9. 109
  10. 87
  11. 90
  12. 89
  13. 91
  14. 64
  15. 78
  16. 127
  17. 56
  18. 116
  19. 118
  20. 86
  21. 73
  22. 68
  23. 102
  24. 72
  25. 100
  26. 118
  27. 69
  28. 105
  29. 72
  30. 50
  31. 124
  32. 136
  33. 101
  34. 92
  35. 125
  36. 69
  37. 105
  38. 119
  39. 97
  40. 111

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