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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 629 · 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.A school has 821 children. 181 of them are girls. How many boys are there?
  2. 2.A school has 513 children. 303 of them are girls. How many boys are there?
  3. 3.228 − ? = 102
  4. 4.? − 490 = 294
  5. 5.A school has 733 children. 123 of them are girls. How many boys are there?
  6. 6.A school has 569 children. 131 of them are girls. How many boys are there?
  7. 7.568 − 494 =
  8. 8.329 + 512 =
  9. 9.721 − ? = 203
  10. 10.A school has 769 children. 744 of them are girls. How many boys are there?
  11. 11.A school has 342 children. 114 of them are girls. How many boys are there?
  12. 12.473 + ? = 691
  13. 13.183 + 714 =
  14. 14.A school has 935 children. 498 of them are girls. How many boys are there?
  15. 15.717 − 337 =
  16. 16.? − 526 = 57
  17. 17.A train has 130 people in the front coaches and 396 people in the back coaches. How many people are on the train?
  18. 18.735 − 330 =
  19. 19.778 − ? = 389
  20. 20.346 − 168 =
  21. 21.A school has 966 children. 469 of them are girls. How many boys are there?
  22. 22.310 − ? = 196
  23. 23.894 + 102 =
  24. 24.610 − 342 =
  25. 25.517 − 449 =
  26. 26.? − 910 = 52
  27. 27.717 − 704 =
  28. 28.? − 247 = 50
  29. 29.? − 621 = 299
  30. 30.744 − 524 =
  31. 31.998 − 986 =
  32. 32.A school has 467 children. 399 of them are girls. How many boys are there?
  33. 33.558 + 383 =
  34. 34.600 − 540 =
  35. 35.A train has 293 people in the front coaches and 658 people in the back coaches. How many people are on the train?
  36. 36.A school has 359 children. 210 of them are girls. How many boys are there?
  37. 37.189 + 161 =
  38. 38.A school has 381 children. 338 of them are girls. How many boys are there?
  39. 39.? + 247 = 649
  40. 40.788 + ? = 905

Answer key

  1. 640
  2. 210
  3. 126
  4. 784
  5. 610
  6. 438
  7. 74
  8. 841
  9. 518
  10. 25
  11. 228
  12. 218
  13. 897
  14. 437
  15. 380
  16. 583
  17. 526
  18. 405
  19. 389
  20. 178
  21. 497
  22. 114
  23. 996
  24. 268
  25. 68
  26. 962
  27. 13
  28. 297
  29. 920
  30. 220
  31. 12
  32. 68
  33. 941
  34. 60
  35. 951
  36. 149
  37. 350
  38. 43
  39. 402
  40. 117

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