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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 968 · 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. 1.284 − 204 =
  2. 2.287 + 701 =
  3. 3.A school has 648 children. 217 of them are girls. How many boys are there?
  4. 4.A train has 779 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  5. 5.A train has 715 people in the front coaches and 188 people in the back coaches. How many people are on the train?
  6. 6.A school has 353 children. 281 of them are girls. How many boys are there?
  7. 7.A train has 379 people in the front coaches and 283 people in the back coaches. How many people are on the train?
  8. 8.A school has 324 children. 127 of them are girls. How many boys are there?
  9. 9.774 − ? = 674
  10. 10.911 − 137 =
  11. 11.A school has 446 children. 185 of them are girls. How many boys are there?
  12. 12.559 + 151 =
  13. 13.994 − ? = 641
  14. 14.? + 460 = 951
  15. 15.786 + 189 =
  16. 16.A school has 337 children. 312 of them are girls. How many boys are there?
  17. 17.? + 781 = 881
  18. 18.629 − ? = 278
  19. 19.987 − ? = 376
  20. 20.413 + ? = 765
  21. 21.214 + 144 =
  22. 22.226 + ? = 333
  23. 23.787 + 101 =
  24. 24.A school has 581 children. 239 of them are girls. How many boys are there?
  25. 25.A school has 578 children. 119 of them are girls. How many boys are there?
  26. 26.852 − 846 =
  27. 27.A school has 553 children. 252 of them are girls. How many boys are there?
  28. 28.A train has 353 people in the front coaches and 599 people in the back coaches. How many people are on the train?
  29. 29.345 + ? = 889
  30. 30.A train has 362 people in the front coaches and 198 people in the back coaches. How many people are on the train?
  31. 31.884 + 114 =
  32. 32.A school has 671 children. 222 of them are girls. How many boys are there?
  33. 33.A train has 821 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  34. 34.403 − ? = 79
  35. 35.A train has 897 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  36. 36.212 + ? = 409
  37. 37.748 − ? = 103
  38. 38.? − 324 = 109
  39. 39.392 + 305 =
  40. 40.A train has 744 people in the front coaches and 205 people in the back coaches. How many people are on the train?

Answer key

  1. 80
  2. 988
  3. 431
  4. 900
  5. 903
  6. 72
  7. 662
  8. 197
  9. 100
  10. 774
  11. 261
  12. 710
  13. 353
  14. 491
  15. 975
  16. 25
  17. 100
  18. 351
  19. 611
  20. 352
  21. 358
  22. 107
  23. 888
  24. 342
  25. 459
  26. 6
  27. 301
  28. 952
  29. 544
  30. 560
  31. 998
  32. 449
  33. 997
  34. 324
  35. 999
  36. 197
  37. 645
  38. 433
  39. 697
  40. 949

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