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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 674 · 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. 1.103 + 736 =
  2. 2.? − 743 = 155
  3. 3.240 + 233 =
  4. 4.447 + 246 =
  5. 5.468 − 199 =
  6. 6.900 − 413 =
  7. 7.768 + 129 =
  8. 8.201 + ? = 951
  9. 9.915 − ? = 739
  10. 10.795 + 108 =
  11. 11.A school has 583 children. 472 of them are girls. How many boys are there?
  12. 12.? + 424 = 630
  13. 13.? − 113 = 630
  14. 14.331 + 137 =
  15. 15.824 − ? = 639
  16. 16.263 + 522 =
  17. 17.194 + 464 =
  18. 18.A train has 165 people in the front coaches and 672 people in the back coaches. How many people are on the train?
  19. 19.? − 793 = 128
  20. 20.A train has 297 people in the front coaches and 438 people in the back coaches. How many people are on the train?
  21. 21.? − 151 = 446
  22. 22.A school has 823 children. 172 of them are girls. How many boys are there?
  23. 23.101 + 119 =
  24. 24.A school has 610 children. 284 of them are girls. How many boys are there?
  25. 25.A school has 807 children. 697 of them are girls. How many boys are there?
  26. 26.A school has 328 children. 325 of them are girls. How many boys are there?
  27. 27.A train has 735 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  28. 28.A school has 280 children. 182 of them are girls. How many boys are there?
  29. 29.714 + 104 =
  30. 30.996 − 595 =
  31. 31.A school has 391 children. 196 of them are girls. How many boys are there?
  32. 32.426 − 377 =
  33. 33.833 + 114 =
  34. 34.383 + 518 =
  35. 35.663 − 499 =
  36. 36.? + 838 = 950
  37. 37.605 + 390 =
  38. 38.A train has 502 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  39. 39.A train has 538 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  40. 40.A train has 690 people in the front coaches and 247 people in the back coaches. How many people are on the train?

Answer key

  1. 839
  2. 898
  3. 473
  4. 693
  5. 269
  6. 487
  7. 897
  8. 750
  9. 176
  10. 903
  11. 111
  12. 206
  13. 743
  14. 468
  15. 185
  16. 785
  17. 658
  18. 837
  19. 921
  20. 735
  21. 597
  22. 651
  23. 220
  24. 326
  25. 110
  26. 3
  27. 924
  28. 98
  29. 818
  30. 401
  31. 195
  32. 49
  33. 947
  34. 901
  35. 164
  36. 112
  37. 995
  38. 872
  39. 938
  40. 937

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