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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 606 · 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 522 people in the front coaches and 196 people in the back coaches. How many people are on the train?
  2. 2.573 − 375 =
  3. 3.399 − 169 =
  4. 4.896 − 652 =
  5. 5.? + 482 = 759
  6. 6.208 − ? = 67
  7. 7.A school has 699 children. 355 of them are girls. How many boys are there?
  8. 8.A train has 334 people in the front coaches and 183 people in the back coaches. How many people are on the train?
  9. 9.A school has 972 children. 444 of them are girls. How many boys are there?
  10. 10.350 − ? = 227
  11. 11.903 − ? = 273
  12. 12.389 − 352 =
  13. 13.981 − 285 =
  14. 14.A train has 534 people in the front coaches and 429 people in the back coaches. How many people are on the train?
  15. 15.200 − ? = 91
  16. 16.105 + ? = 517
  17. 17.686 + ? = 970
  18. 18.? + 534 = 909
  19. 19.729 + 194 =
  20. 20.738 − ? = 579
  21. 21.706 − ? = 44
  22. 22.? − 441 = 190
  23. 23.? − 457 = 282
  24. 24.A train has 523 people in the front coaches and 273 people in the back coaches. How many people are on the train?
  25. 25.764 + 128 =
  26. 26.A school has 397 children. 177 of them are girls. How many boys are there?
  27. 27.? + 575 = 713
  28. 28.A train has 249 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  29. 29.239 − 129 =
  30. 30.431 + 485 =
  31. 31.? − 226 = 567
  32. 32.271 + 213 =
  33. 33.A school has 328 children. 181 of them are girls. How many boys are there?
  34. 34.? + 172 = 453
  35. 35.490 + ? = 998
  36. 36.A school has 858 children. 638 of them are girls. How many boys are there?
  37. 37.231 + 179 =
  38. 38.170 + 388 =
  39. 39.279 + 660 =
  40. 40.? − 720 = 22

Answer key

  1. 718
  2. 198
  3. 230
  4. 244
  5. 277
  6. 141
  7. 344
  8. 517
  9. 528
  10. 123
  11. 630
  12. 37
  13. 696
  14. 963
  15. 109
  16. 412
  17. 284
  18. 375
  19. 923
  20. 159
  21. 662
  22. 631
  23. 739
  24. 796
  25. 892
  26. 220
  27. 138
  28. 515
  29. 110
  30. 916
  31. 793
  32. 484
  33. 147
  34. 281
  35. 508
  36. 220
  37. 410
  38. 558
  39. 939
  40. 742

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