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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 155 · 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. 1.200 + ? = 785
  2. 2.A school has 614 children. 178 of them are girls. How many boys are there?
  3. 3.? + 506 = 753
  4. 4.A school has 945 children. 329 of them are girls. How many boys are there?
  5. 5.425 − ? = 25
  6. 6.374 − 201 =
  7. 7.A train has 136 people in the front coaches and 574 people in the back coaches. How many people are on the train?
  8. 8.A school has 377 children. 186 of them are girls. How many boys are there?
  9. 9.543 + 217 =
  10. 10.260 + 119 =
  11. 11.A school has 612 children. 361 of them are girls. How many boys are there?
  12. 12.191 + 192 =
  13. 13.889 − ? = 724
  14. 14.561 − ? = 2
  15. 15.544 − ? = 131
  16. 16.943 − ? = 525
  17. 17.A train has 834 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  18. 18.427 − ? = 300
  19. 19.443 + ? = 669
  20. 20.367 + 596 =
  21. 21.558 + 188 =
  22. 22.A school has 649 children. 573 of them are girls. How many boys are there?
  23. 23.? + 646 = 992
  24. 24.865 + 116 =
  25. 25.306 + 100 =
  26. 26.? + 513 = 718
  27. 27.858 − 167 =
  28. 28.676 + ? = 836
  29. 29.138 + ? = 734
  30. 30.A school has 870 children. 682 of them are girls. How many boys are there?
  31. 31.? − 344 = 173
  32. 32.811 + 149 =
  33. 33.538 − 498 =
  34. 34.598 − ? = 295
  35. 35.A school has 521 children. 190 of them are girls. How many boys are there?
  36. 36.A school has 823 children. 604 of them are girls. How many boys are there?
  37. 37.624 + 327 =
  38. 38.689 − 114 =
  39. 39.821 + 111 =
  40. 40.? + 334 = 778

Answer key

  1. 585
  2. 436
  3. 247
  4. 616
  5. 400
  6. 173
  7. 710
  8. 191
  9. 760
  10. 379
  11. 251
  12. 383
  13. 165
  14. 559
  15. 413
  16. 418
  17. 986
  18. 127
  19. 226
  20. 963
  21. 746
  22. 76
  23. 346
  24. 981
  25. 406
  26. 205
  27. 691
  28. 160
  29. 596
  30. 188
  31. 517
  32. 960
  33. 40
  34. 303
  35. 331
  36. 219
  37. 951
  38. 575
  39. 932
  40. 444

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