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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 827 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.565 + 289 =
  2. 2.222 − ? = 114
  3. 3.542 − 260 =
  4. 4.818 + 142 =
  5. 5.884 − ? = 242
  6. 6.A school has 922 children. 112 of them are girls. How many boys are there?
  7. 7.357 − ? = 240
  8. 8.? − 612 = 150
  9. 9.A school has 371 children. 358 of them are girls. How many boys are there?
  10. 10.A school has 265 children. 254 of them are girls. How many boys are there?
  11. 11.721 + ? = 853
  12. 12.A school has 327 children. 292 of them are girls. How many boys are there?
  13. 13.871 + 103 =
  14. 14.A school has 722 children. 704 of them are girls. How many boys are there?
  15. 15.A school has 610 children. 248 of them are girls. How many boys are there?
  16. 16.? − 437 = 303
  17. 17.A school has 823 children. 618 of them are girls. How many boys are there?
  18. 18.116 + 363 =
  19. 19.A train has 269 people in the front coaches and 235 people in the back coaches. How many people are on the train?
  20. 20.? + 631 = 885
  21. 21.A school has 324 children. 184 of them are girls. How many boys are there?
  22. 22.773 − 163 =
  23. 23.? − 179 = 394
  24. 24.219 − 109 =
  25. 25.A train has 807 people in the front coaches and 148 people in the back coaches. How many people are on the train?
  26. 26.363 + 149 =
  27. 27.? − 138 = 166
  28. 28.681 + 233 =
  29. 29.584 − 139 =
  30. 30.? − 292 = 135
  31. 31.758 − ? = 50
  32. 32.168 + 764 =
  33. 33.A school has 391 children. 260 of them are girls. How many boys are there?
  34. 34.664 − ? = 536
  35. 35.529 + 111 =
  36. 36.992 − ? = 303
  37. 37.? − 160 = 490
  38. 38.A train has 195 people in the front coaches and 683 people in the back coaches. How many people are on the train?
  39. 39.A school has 933 children. 825 of them are girls. How many boys are there?
  40. 40.964 − 780 =

Answer key

  1. 854
  2. 108
  3. 282
  4. 960
  5. 642
  6. 810
  7. 117
  8. 762
  9. 13
  10. 11
  11. 132
  12. 35
  13. 974
  14. 18
  15. 362
  16. 740
  17. 205
  18. 479
  19. 504
  20. 254
  21. 140
  22. 610
  23. 573
  24. 110
  25. 955
  26. 512
  27. 304
  28. 914
  29. 445
  30. 427
  31. 708
  32. 932
  33. 131
  34. 128
  35. 640
  36. 689
  37. 650
  38. 878
  39. 108
  40. 184

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