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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 919 · 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 train has 478 people in the front coaches and 240 people in the back coaches. How many people are on the train?
  2. 2.471 − 435 =
  3. 3.? + 109 = 238
  4. 4.229 − 137 =
  5. 5.? + 250 = 822
  6. 6.281 + 686 =
  7. 7.897 + 100 =
  8. 8.A school has 809 children. 417 of them are girls. How many boys are there?
  9. 9.A school has 521 children. 259 of them are girls. How many boys are there?
  10. 10.862 − ? = 667
  11. 11.386 − 239 =
  12. 12.243 + 535 =
  13. 13.? + 258 = 482
  14. 14.139 + ? = 656
  15. 15.? + 284 = 781
  16. 16.694 − ? = 425
  17. 17.976 − 411 =
  18. 18.495 + 223 =
  19. 19.A school has 933 children. 547 of them are girls. How many boys are there?
  20. 20.160 + 146 =
  21. 21.? − 212 = 391
  22. 22.905 − 816 =
  23. 23.877 + 108 =
  24. 24.A train has 300 people in the front coaches and 245 people in the back coaches. How many people are on the train?
  25. 25.621 − ? = 374
  26. 26.273 − 133 =
  27. 27.? − 162 = 759
  28. 28.A train has 489 people in the front coaches and 423 people in the back coaches. How many people are on the train?
  29. 29.A school has 899 children. 719 of them are girls. How many boys are there?
  30. 30.A train has 771 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  31. 31.A train has 352 people in the front coaches and 563 people in the back coaches. How many people are on the train?
  32. 32.A school has 249 children. 100 of them are girls. How many boys are there?
  33. 33.501 + ? = 903
  34. 34.666 − 542 =
  35. 35.565 + ? = 950
  36. 36.A school has 451 children. 232 of them are girls. How many boys are there?
  37. 37.318 − ? = 127
  38. 38.A school has 465 children. 183 of them are girls. How many boys are there?
  39. 39.A school has 666 children. 214 of them are girls. How many boys are there?
  40. 40.502 − 494 =

Answer key

  1. 718
  2. 36
  3. 129
  4. 92
  5. 572
  6. 967
  7. 997
  8. 392
  9. 262
  10. 195
  11. 147
  12. 778
  13. 224
  14. 517
  15. 497
  16. 269
  17. 565
  18. 718
  19. 386
  20. 306
  21. 603
  22. 89
  23. 985
  24. 545
  25. 247
  26. 140
  27. 921
  28. 912
  29. 180
  30. 877
  31. 915
  32. 149
  33. 402
  34. 124
  35. 385
  36. 219
  37. 191
  38. 282
  39. 452
  40. 8

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