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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 321 · 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. 1.31 + 18 =
  2. 2.62 + 13 =
  3. 3.27 + 72 =
  4. 4.23 + 32 =
  5. 5.60 + 21 =
  6. 6.22 + 44 =
  7. 7.45 + 43 =
  8. 8.84 + 88 =
  9. 9.64 + 31 =
  10. 10.42 + 28 =
  11. 11.53 + 18 =
  12. 12.82 + 78 =
  13. 13.22 + 31 =
  14. 14.34 + 42 =
  15. 15.44 + 45 =
  16. 16.24 + 83 =
  17. 17.88 + 56 =
  18. 18.61 + 43 =
  19. 19.32 + 59 =
  20. 20.34 + 19 =
  21. 21.51 + 12 =
  22. 22.77 + 36 =
  23. 23.80 + 56 =
  24. 24.36 + 15 =
  25. 25.83 + 81 =
  26. 26.83 + 21 =
  27. 27.72 + 37 =
  28. 28.36 + 55 =
  29. 29.72 + 31 =
  30. 30.57 + 71 =
  31. 31.33 + 54 =
  32. 32.22 + 34 =
  33. 33.49 + 41 =
  34. 34.39 + 74 =
  35. 35.47 + 57 =
  36. 36.83 + 83 =
  37. 37.24 + 41 =
  38. 38.38 + 15 =
  39. 39.58 + 38 =
  40. 40.48 + 86 =

Answer key

  1. 49
  2. 75
  3. 99
  4. 55
  5. 81
  6. 66
  7. 88
  8. 172
  9. 95
  10. 70
  11. 71
  12. 160
  13. 53
  14. 76
  15. 89
  16. 107
  17. 144
  18. 104
  19. 91
  20. 53
  21. 63
  22. 113
  23. 136
  24. 51
  25. 164
  26. 104
  27. 109
  28. 91
  29. 103
  30. 128
  31. 87
  32. 56
  33. 90
  34. 113
  35. 104
  36. 166
  37. 65
  38. 53
  39. 96
  40. 134

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