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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 660 · 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. 1.195 + 748 =
  2. 2.575 + 187 =
  3. 3.A train has 549 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  4. 4.A train has 558 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  5. 5.A train has 694 people in the front coaches and 184 people in the back coaches. How many people are on the train?
  6. 6.781 + 201 =
  7. 7.898 − 748 =
  8. 8.? − 125 = 83
  9. 9.101 + 776 =
  10. 10.? − 851 = 72
  11. 11.547 − 143 =
  12. 12.192 + ? = 553
  13. 13.A train has 107 people in the front coaches and 345 people in the back coaches. How many people are on the train?
  14. 14.A train has 459 people in the front coaches and 178 people in the back coaches. How many people are on the train?
  15. 15.A school has 901 children. 567 of them are girls. How many boys are there?
  16. 16.? + 106 = 473
  17. 17.? − 292 = 588
  18. 18.A school has 580 children. 320 of them are girls. How many boys are there?
  19. 19.894 − 391 =
  20. 20.865 − 762 =
  21. 21.343 − 268 =
  22. 22.A train has 302 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  23. 23.? − 328 = 187
  24. 24.272 + 274 =
  25. 25.321 − 203 =
  26. 26.790 + ? = 909
  27. 27.A school has 239 children. 221 of them are girls. How many boys are there?
  28. 28.451 − ? = 345
  29. 29.195 + ? = 566
  30. 30.548 + 166 =
  31. 31.216 + ? = 496
  32. 32.649 + 144 =
  33. 33.624 + ? = 852
  34. 34.695 − ? = 53
  35. 35.236 + ? = 667
  36. 36.697 + 144 =
  37. 37.310 − 201 =
  38. 38.847 + 129 =
  39. 39.A school has 870 children. 491 of them are girls. How many boys are there?
  40. 40.252 − ? = 134

Answer key

  1. 943
  2. 762
  3. 729
  4. 664
  5. 878
  6. 982
  7. 150
  8. 208
  9. 877
  10. 923
  11. 404
  12. 361
  13. 452
  14. 637
  15. 334
  16. 367
  17. 880
  18. 260
  19. 503
  20. 103
  21. 75
  22. 408
  23. 515
  24. 546
  25. 118
  26. 119
  27. 18
  28. 106
  29. 371
  30. 714
  31. 280
  32. 793
  33. 228
  34. 642
  35. 431
  36. 841
  37. 109
  38. 976
  39. 379
  40. 118

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