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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 735 · 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. 1.51 + 21 =
  2. 2.75 + 13 =
  3. 3.34 + 19 =
  4. 4.38 + 57 =
  5. 5.51 + 32 =
  6. 6.31 + 72 =
  7. 7.22 + 42 =
  8. 8.21 + 14 =
  9. 9.39 + 69 =
  10. 10.86 + 42 =
  11. 11.58 + 33 =
  12. 12.37 + 22 =
  13. 13.69 + 42 =
  14. 14.40 + 38 =
  15. 15.45 + 21 =
  16. 16.46 + 46 =
  17. 17.24 + 63 =
  18. 18.41 + 33 =
  19. 19.71 + 85 =
  20. 20.40 + 41 =
  21. 21.34 + 15 =
  22. 22.82 + 84 =
  23. 23.65 + 84 =
  24. 24.35 + 56 =
  25. 25.52 + 34 =
  26. 26.69 + 16 =
  27. 27.52 + 25 =
  28. 28.42 + 85 =
  29. 29.68 + 44 =
  30. 30.78 + 26 =
  31. 31.37 + 21 =
  32. 32.23 + 54 =
  33. 33.81 + 75 =
  34. 34.72 + 88 =
  35. 35.65 + 67 =
  36. 36.23 + 28 =
  37. 37.83 + 24 =
  38. 38.34 + 22 =
  39. 39.71 + 27 =
  40. 40.70 + 78 =

Answer key

  1. 72
  2. 88
  3. 53
  4. 95
  5. 83
  6. 103
  7. 64
  8. 35
  9. 108
  10. 128
  11. 91
  12. 59
  13. 111
  14. 78
  15. 66
  16. 92
  17. 87
  18. 74
  19. 156
  20. 81
  21. 49
  22. 166
  23. 149
  24. 91
  25. 86
  26. 85
  27. 77
  28. 127
  29. 112
  30. 104
  31. 58
  32. 77
  33. 156
  34. 160
  35. 132
  36. 51
  37. 107
  38. 56
  39. 98
  40. 148

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