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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 30 · 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. 1.276 + 537 =
  2. 2.A train has 688 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  3. 3.383 + 444 =
  4. 4.A school has 444 children. 193 of them are girls. How many boys are there?
  5. 5.189 + ? = 831
  6. 6.355 − 353 =
  7. 7.278 − 112 =
  8. 8.891 − ? = 679
  9. 9.417 − ? = 305
  10. 10.? + 618 = 790
  11. 11.316 + ? = 977
  12. 12.403 + 580 =
  13. 13.343 + 551 =
  14. 14.515 + 350 =
  15. 15.818 + 181 =
  16. 16.? − 691 = 15
  17. 17.640 + 133 =
  18. 18.432 + 376 =
  19. 19.790 − 378 =
  20. 20.697 − 302 =
  21. 21.? + 274 = 413
  22. 22.167 + ? = 565
  23. 23.A school has 858 children. 627 of them are girls. How many boys are there?
  24. 24.A train has 620 people in the front coaches and 132 people in the back coaches. How many people are on the train?
  25. 25.A school has 304 children. 242 of them are girls. How many boys are there?
  26. 26.372 − 128 =
  27. 27.A train has 380 people in the front coaches and 488 people in the back coaches. How many people are on the train?
  28. 28.? − 870 = 48
  29. 29.306 + ? = 838
  30. 30.240 − 150 =
  31. 31.A school has 242 children. 131 of them are girls. How many boys are there?
  32. 32.A train has 635 people in the front coaches and 338 people in the back coaches. How many people are on the train?
  33. 33.554 − 550 =
  34. 34.372 + 415 =
  35. 35.214 − 193 =
  36. 36.A school has 234 children. 181 of them are girls. How many boys are there?
  37. 37.671 + ? = 815
  38. 38.940 − ? = 823
  39. 39.701 + 154 =
  40. 40.616 + ? = 893

Answer key

  1. 813
  2. 887
  3. 827
  4. 251
  5. 642
  6. 2
  7. 166
  8. 212
  9. 112
  10. 172
  11. 661
  12. 983
  13. 894
  14. 865
  15. 999
  16. 706
  17. 773
  18. 808
  19. 412
  20. 395
  21. 139
  22. 398
  23. 231
  24. 752
  25. 62
  26. 244
  27. 868
  28. 918
  29. 532
  30. 90
  31. 111
  32. 973
  33. 4
  34. 787
  35. 21
  36. 53
  37. 144
  38. 117
  39. 855
  40. 277

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