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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 5 · 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. 1.29 + 34 =
  2. 2.45 + 71 =
  3. 3.79 + 39 =
  4. 4.28 + 78 =
  5. 5.67 + 37 =
  6. 6.39 + 25 =
  7. 7.32 + 19 =
  8. 8.48 + 18 =
  9. 9.34 + 47 =
  10. 10.41 + 75 =
  11. 11.57 + 24 =
  12. 12.35 + 79 =
  13. 13.49 + 12 =
  14. 14.33 + 86 =
  15. 15.39 + 79 =
  16. 16.29 + 14 =
  17. 17.45 + 35 =
  18. 18.51 + 18 =
  19. 19.40 + 36 =
  20. 20.55 + 13 =
  21. 21.82 + 65 =
  22. 22.68 + 49 =
  23. 23.25 + 44 =
  24. 24.73 + 68 =
  25. 25.89 + 17 =
  26. 26.44 + 37 =
  27. 27.86 + 79 =
  28. 28.84 + 21 =
  29. 29.38 + 89 =
  30. 30.73 + 64 =
  31. 31.32 + 69 =
  32. 32.31 + 35 =
  33. 33.22 + 41 =
  34. 34.77 + 38 =
  35. 35.89 + 22 =
  36. 36.38 + 36 =
  37. 37.75 + 21 =
  38. 38.40 + 42 =
  39. 39.52 + 62 =
  40. 40.40 + 15 =

Answer key

  1. 63
  2. 116
  3. 118
  4. 106
  5. 104
  6. 64
  7. 51
  8. 66
  9. 81
  10. 116
  11. 81
  12. 114
  13. 61
  14. 119
  15. 118
  16. 43
  17. 80
  18. 69
  19. 76
  20. 68
  21. 147
  22. 117
  23. 69
  24. 141
  25. 106
  26. 81
  27. 165
  28. 105
  29. 127
  30. 137
  31. 101
  32. 66
  33. 63
  34. 115
  35. 111
  36. 74
  37. 96
  38. 82
  39. 114
  40. 55

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