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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 760 · 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 428 people in the front coaches and 566 people in the back coaches. How many people are on the train?
  2. 2.? − 284 = 387
  3. 3.? − 122 = 629
  4. 4.? − 119 = 878
  5. 5.253 + 413 =
  6. 6.774 − ? = 298
  7. 7.395 − ? = 40
  8. 8.A school has 255 children. 179 of them are girls. How many boys are there?
  9. 9.A train has 313 people in the front coaches and 329 people in the back coaches. How many people are on the train?
  10. 10.565 − 124 =
  11. 11.341 − 104 =
  12. 12.992 − 848 =
  13. 13.A school has 517 children. 359 of them are girls. How many boys are there?
  14. 14.A train has 176 people in the front coaches and 369 people in the back coaches. How many people are on the train?
  15. 15.A school has 517 children. 453 of them are girls. How many boys are there?
  16. 16.712 + 122 =
  17. 17.286 + 261 =
  18. 18.373 − ? = 26
  19. 19.205 + 566 =
  20. 20.212 − ? = 2
  21. 21.407 − 347 =
  22. 22.? + 485 = 679
  23. 23.A train has 774 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  24. 24.A school has 703 children. 190 of them are girls. How many boys are there?
  25. 25.395 + 167 =
  26. 26.A train has 762 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  27. 27.A school has 683 children. 675 of them are girls. How many boys are there?
  28. 28.604 − 538 =
  29. 29.A school has 361 children. 207 of them are girls. How many boys are there?
  30. 30.A train has 298 people in the front coaches and 513 people in the back coaches. How many people are on the train?
  31. 31.A school has 722 children. 124 of them are girls. How many boys are there?
  32. 32.246 + 488 =
  33. 33.A school has 633 children. 245 of them are girls. How many boys are there?
  34. 34.415 − 321 =
  35. 35.282 + 597 =
  36. 36.477 + 383 =
  37. 37.A school has 597 children. 116 of them are girls. How many boys are there?
  38. 38.A school has 741 children. 473 of them are girls. How many boys are there?
  39. 39.? + 790 = 979
  40. 40.A school has 543 children. 295 of them are girls. How many boys are there?

Answer key

  1. 994
  2. 671
  3. 751
  4. 997
  5. 666
  6. 476
  7. 355
  8. 76
  9. 642
  10. 441
  11. 237
  12. 144
  13. 158
  14. 545
  15. 64
  16. 834
  17. 547
  18. 347
  19. 771
  20. 210
  21. 60
  22. 194
  23. 996
  24. 513
  25. 562
  26. 880
  27. 8
  28. 66
  29. 154
  30. 811
  31. 598
  32. 734
  33. 388
  34. 94
  35. 879
  36. 860
  37. 481
  38. 268
  39. 189
  40. 248

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