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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 177 · 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. 1.598 + 106 =
  2. 2.? + 195 = 791
  3. 3.A train has 395 people in the front coaches and 396 people in the back coaches. How many people are on the train?
  4. 4.604 + 251 =
  5. 5.657 − 238 =
  6. 6.673 − 660 =
  7. 7.426 + 483 =
  8. 8.A school has 418 children. 121 of them are girls. How many boys are there?
  9. 9.253 + 647 =
  10. 10.A school has 792 children. 410 of them are girls. How many boys are there?
  11. 11.? + 217 = 556
  12. 12.680 − 117 =
  13. 13.? + 333 = 495
  14. 14.A train has 412 people in the front coaches and 538 people in the back coaches. How many people are on the train?
  15. 15.A train has 149 people in the front coaches and 536 people in the back coaches. How many people are on the train?
  16. 16.A train has 547 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  17. 17.A school has 277 children. 253 of them are girls. How many boys are there?
  18. 18.220 + ? = 480
  19. 19.754 + ? = 876
  20. 20.848 + 149 =
  21. 21.594 + 138 =
  22. 22.? − 349 = 544
  23. 23.? + 861 = 992
  24. 24.A train has 860 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  25. 25.A train has 490 people in the front coaches and 146 people in the back coaches. How many people are on the train?
  26. 26.204 + ? = 868
  27. 27.572 + 254 =
  28. 28.A train has 717 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  29. 29.544 + 175 =
  30. 30.681 − 614 =
  31. 31.A school has 211 children. 201 of them are girls. How many boys are there?
  32. 32.A train has 221 people in the front coaches and 267 people in the back coaches. How many people are on the train?
  33. 33.973 − ? = 260
  34. 34.288 − ? = 126
  35. 35.802 − ? = 304
  36. 36.195 + ? = 514
  37. 37.974 − ? = 162
  38. 38.554 − ? = 309
  39. 39.266 − 116 =
  40. 40.160 + 299 =

Answer key

  1. 704
  2. 596
  3. 791
  4. 855
  5. 419
  6. 13
  7. 909
  8. 297
  9. 900
  10. 382
  11. 339
  12. 563
  13. 162
  14. 950
  15. 685
  16. 663
  17. 24
  18. 260
  19. 122
  20. 997
  21. 732
  22. 893
  23. 131
  24. 970
  25. 636
  26. 664
  27. 826
  28. 828
  29. 719
  30. 67
  31. 10
  32. 488
  33. 713
  34. 162
  35. 498
  36. 319
  37. 812
  38. 245
  39. 150
  40. 459

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