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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 390 · 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 + 43 =
  2. 2.26 + 51 =
  3. 3.78 + 29 =
  4. 4.79 + 54 =
  5. 5.24 + 16 =
  6. 6.34 + 46 =
  7. 7.82 + 51 =
  8. 8.48 + 87 =
  9. 9.66 + 14 =
  10. 10.67 + 47 =
  11. 11.23 + 21 =
  12. 12.81 + 26 =
  13. 13.38 + 19 =
  14. 14.28 + 43 =
  15. 15.31 + 41 =
  16. 16.84 + 58 =
  17. 17.54 + 57 =
  18. 18.64 + 52 =
  19. 19.28 + 85 =
  20. 20.28 + 37 =
  21. 21.76 + 58 =
  22. 22.82 + 13 =
  23. 23.51 + 44 =
  24. 24.24 + 75 =
  25. 25.32 + 21 =
  26. 26.23 + 88 =
  27. 27.36 + 51 =
  28. 28.58 + 84 =
  29. 29.34 + 62 =
  30. 30.53 + 62 =
  31. 31.68 + 56 =
  32. 32.70 + 53 =
  33. 33.25 + 77 =
  34. 34.85 + 46 =
  35. 35.82 + 25 =
  36. 36.34 + 67 =
  37. 37.87 + 26 =
  38. 38.40 + 71 =
  39. 39.85 + 84 =
  40. 40.29 + 51 =

Answer key

  1. 88
  2. 77
  3. 107
  4. 133
  5. 40
  6. 80
  7. 133
  8. 135
  9. 80
  10. 114
  11. 44
  12. 107
  13. 57
  14. 71
  15. 72
  16. 142
  17. 111
  18. 116
  19. 113
  20. 65
  21. 134
  22. 95
  23. 95
  24. 99
  25. 53
  26. 111
  27. 87
  28. 142
  29. 96
  30. 115
  31. 124
  32. 123
  33. 102
  34. 131
  35. 107
  36. 101
  37. 113
  38. 111
  39. 169
  40. 80

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