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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 489 · 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. 1.549 + 135 =
  2. 2.900 − ? = 139
  3. 3.981 − 307 =
  4. 4.A school has 489 children. 394 of them are girls. How many boys are there?
  5. 5.? + 272 = 727
  6. 6.A train has 819 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  7. 7.396 − ? = 208
  8. 8.117 + 349 =
  9. 9.A train has 368 people in the front coaches and 244 people in the back coaches. How many people are on the train?
  10. 10.? − 175 = 118
  11. 11.542 + ? = 959
  12. 12.788 − ? = 129
  13. 13.297 + ? = 968
  14. 14.? − 321 = 62
  15. 15.A train has 671 people in the front coaches and 193 people in the back coaches. How many people are on the train?
  16. 16.232 − ? = 77
  17. 17.? − 520 = 235
  18. 18.? − 169 = 596
  19. 19.A train has 854 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  20. 20.A school has 983 children. 174 of them are girls. How many boys are there?
  21. 21.278 − 148 =
  22. 22.? − 367 = 245
  23. 23.704 − ? = 301
  24. 24.261 + 209 =
  25. 25.842 − 159 =
  26. 26.326 + ? = 539
  27. 27.717 − 136 =
  28. 28.? + 562 = 667
  29. 29.246 + 216 =
  30. 30.A train has 628 people in the front coaches and 205 people in the back coaches. How many people are on the train?
  31. 31.483 − ? = 115
  32. 32.? + 558 = 751
  33. 33.? + 365 = 894
  34. 34.A train has 408 people in the front coaches and 352 people in the back coaches. How many people are on the train?
  35. 35.296 + 273 =
  36. 36.A train has 681 people in the front coaches and 174 people in the back coaches. How many people are on the train?
  37. 37.535 − ? = 174
  38. 38.A school has 517 children. 368 of them are girls. How many boys are there?
  39. 39.143 + ? = 900
  40. 40.333 − ? = 77

Answer key

  1. 684
  2. 761
  3. 674
  4. 95
  5. 455
  6. 933
  7. 188
  8. 466
  9. 612
  10. 293
  11. 417
  12. 659
  13. 671
  14. 383
  15. 864
  16. 155
  17. 755
  18. 765
  19. 984
  20. 809
  21. 130
  22. 612
  23. 403
  24. 470
  25. 683
  26. 213
  27. 581
  28. 105
  29. 462
  30. 833
  31. 368
  32. 193
  33. 529
  34. 760
  35. 569
  36. 855
  37. 361
  38. 149
  39. 757
  40. 256

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