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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 859 · 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. 1.689 − 686 =
  2. 2.308 + 683 =
  3. 3.A train has 867 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  4. 4.592 − 345 =
  5. 5.594 − 251 =
  6. 6.955 − 468 =
  7. 7.680 − 160 =
  8. 8.? − 430 = 9
  9. 9.A school has 989 children. 391 of them are girls. How many boys are there?
  10. 10.263 − 168 =
  11. 11.? + 785 = 887
  12. 12.284 − ? = 167
  13. 13.309 − 132 =
  14. 14.? + 226 = 715
  15. 15.587 − ? = 68
  16. 16.742 − ? = 267
  17. 17.232 + 572 =
  18. 18.846 + 115 =
  19. 19.? − 168 = 107
  20. 20.252 + 612 =
  21. 21.744 − 117 =
  22. 22.A train has 617 people in the front coaches and 339 people in the back coaches. How many people are on the train?
  23. 23.380 + ? = 525
  24. 24.427 + 451 =
  25. 25.A train has 484 people in the front coaches and 196 people in the back coaches. How many people are on the train?
  26. 26.A school has 511 children. 495 of them are girls. How many boys are there?
  27. 27.210 + 490 =
  28. 28.A train has 549 people in the front coaches and 233 people in the back coaches. How many people are on the train?
  29. 29.A school has 571 children. 415 of them are girls. How many boys are there?
  30. 30.460 − 410 =
  31. 31.629 + 213 =
  32. 32.? + 699 = 876
  33. 33.A train has 463 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  34. 34.A train has 136 people in the front coaches and 789 people in the back coaches. How many people are on the train?
  35. 35.436 + 549 =
  36. 36.A train has 435 people in the front coaches and 408 people in the back coaches. How many people are on the train?
  37. 37.A train has 703 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  38. 38.672 + 132 =
  39. 39.321 − ? = 205
  40. 40.510 − ? = 332

Answer key

  1. 3
  2. 991
  3. 974
  4. 247
  5. 343
  6. 487
  7. 520
  8. 439
  9. 598
  10. 95
  11. 102
  12. 117
  13. 177
  14. 489
  15. 519
  16. 475
  17. 804
  18. 961
  19. 275
  20. 864
  21. 627
  22. 956
  23. 145
  24. 878
  25. 680
  26. 16
  27. 700
  28. 782
  29. 156
  30. 50
  31. 842
  32. 177
  33. 833
  34. 925
  35. 985
  36. 843
  37. 958
  38. 804
  39. 116
  40. 178

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