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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 169 · 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. 1.884 − ? = 718
  2. 2.570 + 166 =
  3. 3.635 + 230 =
  4. 4.? − 156 = 478
  5. 5.A school has 996 children. 226 of them are girls. How many boys are there?
  6. 6.246 + 479 =
  7. 7.A school has 576 children. 558 of them are girls. How many boys are there?
  8. 8.997 − 917 =
  9. 9.? + 491 = 928
  10. 10.435 − 191 =
  11. 11.A train has 319 people in the front coaches and 434 people in the back coaches. How many people are on the train?
  12. 12.300 − 114 =
  13. 13.615 − ? = 117
  14. 14.803 + 114 =
  15. 15.131 + 287 =
  16. 16.A train has 760 people in the front coaches and 165 people in the back coaches. How many people are on the train?
  17. 17.A train has 669 people in the front coaches and 168 people in the back coaches. How many people are on the train?
  18. 18.245 + ? = 729
  19. 19.A train has 680 people in the front coaches and 221 people in the back coaches. How many people are on the train?
  20. 20.A train has 204 people in the front coaches and 290 people in the back coaches. How many people are on the train?
  21. 21.A train has 290 people in the front coaches and 206 people in the back coaches. How many people are on the train?
  22. 22.642 + 272 =
  23. 23.542 − 249 =
  24. 24.450 + 274 =
  25. 25.198 + ? = 451
  26. 26.533 − ? = 117
  27. 27.? − 165 = 623
  28. 28.519 − ? = 316
  29. 29.234 + 228 =
  30. 30.A school has 314 children. 308 of them are girls. How many boys are there?
  31. 31.457 − 127 =
  32. 32.513 + 190 =
  33. 33.281 − 280 =
  34. 34.368 − 133 =
  35. 35.287 − 118 =
  36. 36.644 − ? = 174
  37. 37.A school has 735 children. 115 of them are girls. How many boys are there?
  38. 38.A train has 274 people in the front coaches and 499 people in the back coaches. How many people are on the train?
  39. 39.A train has 247 people in the front coaches and 528 people in the back coaches. How many people are on the train?
  40. 40.416 − 298 =

Answer key

  1. 166
  2. 736
  3. 865
  4. 634
  5. 770
  6. 725
  7. 18
  8. 80
  9. 437
  10. 244
  11. 753
  12. 186
  13. 498
  14. 917
  15. 418
  16. 925
  17. 837
  18. 484
  19. 901
  20. 494
  21. 496
  22. 914
  23. 293
  24. 724
  25. 253
  26. 416
  27. 788
  28. 203
  29. 462
  30. 6
  31. 330
  32. 703
  33. 1
  34. 235
  35. 169
  36. 470
  37. 620
  38. 773
  39. 775
  40. 118

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