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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 474 · 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. 1.866 + 106 =
  2. 2.? − 397 = 499
  3. 3.A train has 197 people in the front coaches and 227 people in the back coaches. How many people are on the train?
  4. 4.? − 411 = 123
  5. 5.? + 766 = 975
  6. 6.741 + 109 =
  7. 7.752 − 245 =
  8. 8.334 + 219 =
  9. 9.880 − 764 =
  10. 10.A school has 816 children. 470 of them are girls. How many boys are there?
  11. 11.A school has 662 children. 576 of them are girls. How many boys are there?
  12. 12.359 − 244 =
  13. 13.A train has 746 people in the front coaches and 175 people in the back coaches. How many people are on the train?
  14. 14.A train has 448 people in the front coaches and 184 people in the back coaches. How many people are on the train?
  15. 15.A school has 217 children. 117 of them are girls. How many boys are there?
  16. 16.239 + ? = 599
  17. 17.671 − ? = 498
  18. 18.740 − 122 =
  19. 19.881 − 601 =
  20. 20.A train has 272 people in the front coaches and 230 people in the back coaches. How many people are on the train?
  21. 21.A school has 800 children. 503 of them are girls. How many boys are there?
  22. 22.A train has 298 people in the front coaches and 337 people in the back coaches. How many people are on the train?
  23. 23.? − 279 = 43
  24. 24.A school has 362 children. 318 of them are girls. How many boys are there?
  25. 25.618 + ? = 926
  26. 26.A school has 678 children. 340 of them are girls. How many boys are there?
  27. 27.A school has 719 children. 221 of them are girls. How many boys are there?
  28. 28.? + 518 = 838
  29. 29.236 + 163 =
  30. 30.710 + 113 =
  31. 31.A school has 990 children. 685 of them are girls. How many boys are there?
  32. 32.333 + 511 =
  33. 33.710 + ? = 819
  34. 34.A school has 967 children. 215 of them are girls. How many boys are there?
  35. 35.548 − ? = 368
  36. 36.170 + 292 =
  37. 37.703 + 276 =
  38. 38.259 + 371 =
  39. 39.A train has 620 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  40. 40.367 + ? = 910

Answer key

  1. 972
  2. 896
  3. 424
  4. 534
  5. 209
  6. 850
  7. 507
  8. 553
  9. 116
  10. 346
  11. 86
  12. 115
  13. 921
  14. 632
  15. 100
  16. 360
  17. 173
  18. 618
  19. 280
  20. 502
  21. 297
  22. 635
  23. 322
  24. 44
  25. 308
  26. 338
  27. 498
  28. 320
  29. 399
  30. 823
  31. 305
  32. 844
  33. 109
  34. 752
  35. 180
  36. 462
  37. 979
  38. 630
  39. 744
  40. 543

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