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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 723 · 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 383 children. 272 of them are girls. How many boys are there?
  2. 2.228 + ? = 890
  3. 3.? + 723 = 945
  4. 4.A school has 421 children. 167 of them are girls. How many boys are there?
  5. 5.715 + 189 =
  6. 6.? − 202 = 555
  7. 7.A school has 394 children. 192 of them are girls. How many boys are there?
  8. 8.444 + 539 =
  9. 9.A school has 507 children. 204 of them are girls. How many boys are there?
  10. 10.353 − ? = 214
  11. 11.453 − 283 =
  12. 12.A school has 424 children. 198 of them are girls. How many boys are there?
  13. 13.411 − 393 =
  14. 14.A school has 452 children. 275 of them are girls. How many boys are there?
  15. 15.A train has 616 people in the front coaches and 192 people in the back coaches. How many people are on the train?
  16. 16.827 − ? = 692
  17. 17.? − 505 = 336
  18. 18.A school has 582 children. 407 of them are girls. How many boys are there?
  19. 19.A school has 396 children. 109 of them are girls. How many boys are there?
  20. 20.? − 180 = 73
  21. 21.A train has 302 people in the front coaches and 229 people in the back coaches. How many people are on the train?
  22. 22.A school has 633 children. 588 of them are girls. How many boys are there?
  23. 23.550 − ? = 346
  24. 24.383 + 364 =
  25. 25.A school has 677 children. 291 of them are girls. How many boys are there?
  26. 26.489 + ? = 830
  27. 27.A school has 391 children. 245 of them are girls. How many boys are there?
  28. 28.238 + ? = 960
  29. 29.A train has 458 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  30. 30.459 − 362 =
  31. 31.813 − ? = 351
  32. 32.A train has 398 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  33. 33.273 − ? = 153
  34. 34.880 − ? = 659
  35. 35.A train has 182 people in the front coaches and 373 people in the back coaches. How many people are on the train?
  36. 36.558 + 156 =
  37. 37.A school has 241 children. 213 of them are girls. How many boys are there?
  38. 38.596 − 372 =
  39. 39.422 − 188 =
  40. 40.685 − 401 =

Answer key

  1. 111
  2. 662
  3. 222
  4. 254
  5. 904
  6. 757
  7. 202
  8. 983
  9. 303
  10. 139
  11. 170
  12. 226
  13. 18
  14. 177
  15. 808
  16. 135
  17. 841
  18. 175
  19. 287
  20. 253
  21. 531
  22. 45
  23. 204
  24. 747
  25. 386
  26. 341
  27. 146
  28. 722
  29. 686
  30. 97
  31. 462
  32. 506
  33. 120
  34. 221
  35. 555
  36. 714
  37. 28
  38. 224
  39. 234
  40. 284

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