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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 86 · 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.A train has 178 people in the front coaches and 229 people in the back coaches. How many people are on the train?
  2. 2.762 − 736 =
  3. 3.395 + 382 =
  4. 4.? − 194 = 93
  5. 5.? − 155 = 296
  6. 6.646 − 416 =
  7. 7.A school has 317 children. 194 of them are girls. How many boys are there?
  8. 8.A train has 548 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  9. 9.836 − 165 =
  10. 10.430 + 299 =
  11. 11.A school has 700 children. 216 of them are girls. How many boys are there?
  12. 12.? − 227 = 58
  13. 13.202 + ? = 453
  14. 14.637 + 297 =
  15. 15.332 − 125 =
  16. 16.333 + 187 =
  17. 17.A train has 617 people in the front coaches and 285 people in the back coaches. How many people are on the train?
  18. 18.A school has 997 children. 656 of them are girls. How many boys are there?
  19. 19.? + 886 = 986
  20. 20.718 + 221 =
  21. 21.782 + ? = 907
  22. 22.411 + 235 =
  23. 23.A school has 488 children. 377 of them are girls. How many boys are there?
  24. 24.210 − 203 =
  25. 25.470 − 214 =
  26. 26.A school has 748 children. 693 of them are girls. How many boys are there?
  27. 27.489 + 256 =
  28. 28.538 + 209 =
  29. 29.429 + 324 =
  30. 30.461 + 529 =
  31. 31.A train has 762 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  32. 32.? + 574 = 848
  33. 33.A train has 693 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  34. 34.630 − 262 =
  35. 35.348 + 433 =
  36. 36.A school has 932 children. 277 of them are girls. How many boys are there?
  37. 37.217 + 305 =
  38. 38.695 − 308 =
  39. 39.394 − ? = 51
  40. 40.428 − 173 =

Answer key

  1. 407
  2. 26
  3. 777
  4. 287
  5. 451
  6. 230
  7. 123
  8. 677
  9. 671
  10. 729
  11. 484
  12. 285
  13. 251
  14. 934
  15. 207
  16. 520
  17. 902
  18. 341
  19. 100
  20. 939
  21. 125
  22. 646
  23. 111
  24. 7
  25. 256
  26. 55
  27. 745
  28. 747
  29. 753
  30. 990
  31. 951
  32. 274
  33. 888
  34. 368
  35. 781
  36. 655
  37. 522
  38. 387
  39. 343
  40. 255

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