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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 402 · 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. 1.384 − 293 =
  2. 2.A school has 337 children. 259 of them are girls. How many boys are there?
  3. 3.558 + 211 =
  4. 4.? − 205 = 145
  5. 5.994 − ? = 428
  6. 6.? − 446 = 15
  7. 7.258 + 285 =
  8. 8.? − 280 = 303
  9. 9.A school has 329 children. 289 of them are girls. How many boys are there?
  10. 10.A school has 877 children. 826 of them are girls. How many boys are there?
  11. 11.? + 232 = 425
  12. 12.477 − ? = 226
  13. 13.A school has 679 children. 525 of them are girls. How many boys are there?
  14. 14.A school has 783 children. 387 of them are girls. How many boys are there?
  15. 15.369 + 206 =
  16. 16.A train has 810 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  17. 17.229 − 107 =
  18. 18.A train has 221 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  19. 19.A school has 763 children. 678 of them are girls. How many boys are there?
  20. 20.792 − 291 =
  21. 21.A school has 742 children. 500 of them are girls. How many boys are there?
  22. 22.181 + 688 =
  23. 23.? − 489 = 28
  24. 24.215 + ? = 749
  25. 25.509 + 279 =
  26. 26.527 − 168 =
  27. 27.A train has 245 people in the front coaches and 671 people in the back coaches. How many people are on the train?
  28. 28.627 − 122 =
  29. 29.? − 225 = 53
  30. 30.302 + 451 =
  31. 31.518 + 296 =
  32. 32.A train has 620 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  33. 33.? + 520 = 863
  34. 34.445 + 190 =
  35. 35.382 + ? = 864
  36. 36.375 − 111 =
  37. 37.105 + 283 =
  38. 38.A school has 371 children. 293 of them are girls. How many boys are there?
  39. 39.878 + 103 =
  40. 40.376 − 320 =

Answer key

  1. 91
  2. 78
  3. 769
  4. 350
  5. 566
  6. 461
  7. 543
  8. 583
  9. 40
  10. 51
  11. 193
  12. 251
  13. 154
  14. 396
  15. 575
  16. 933
  17. 122
  18. 377
  19. 85
  20. 501
  21. 242
  22. 869
  23. 517
  24. 534
  25. 788
  26. 359
  27. 916
  28. 505
  29. 278
  30. 753
  31. 814
  32. 797
  33. 343
  34. 635
  35. 482
  36. 264
  37. 388
  38. 78
  39. 981
  40. 56

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