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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 83 · 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.? + 303 = 436
  2. 2.305 − 242 =
  3. 3.A train has 629 people in the front coaches and 166 people in the back coaches. How many people are on the train?
  4. 4.240 + 461 =
  5. 5.263 + 431 =
  6. 6.713 − 327 =
  7. 7.337 + 445 =
  8. 8.917 − 305 =
  9. 9.? + 282 = 614
  10. 10.A school has 782 children. 567 of them are girls. How many boys are there?
  11. 11.A train has 509 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  12. 12.A school has 789 children. 718 of them are girls. How many boys are there?
  13. 13.159 + 114 =
  14. 14.A train has 368 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  15. 15.143 + 190 =
  16. 16.? − 126 = 226
  17. 17.A train has 298 people in the front coaches and 547 people in the back coaches. How many people are on the train?
  18. 18.981 − 223 =
  19. 19.507 + ? = 721
  20. 20.A train has 188 people in the front coaches and 220 people in the back coaches. How many people are on the train?
  21. 21.A school has 579 children. 236 of them are girls. How many boys are there?
  22. 22.780 + 149 =
  23. 23.907 − 282 =
  24. 24.578 + 145 =
  25. 25.454 + 221 =
  26. 26.A school has 681 children. 108 of them are girls. How many boys are there?
  27. 27.533 + ? = 689
  28. 28.387 + 140 =
  29. 29.652 + 294 =
  30. 30.824 + 135 =
  31. 31.739 − ? = 20
  32. 32.474 + 325 =
  33. 33.? − 583 = 199
  34. 34.A school has 904 children. 603 of them are girls. How many boys are there?
  35. 35.A train has 575 people in the front coaches and 252 people in the back coaches. How many people are on the train?
  36. 36.A school has 244 children. 201 of them are girls. How many boys are there?
  37. 37.668 + 145 =
  38. 38.752 − 375 =
  39. 39.A school has 427 children. 117 of them are girls. How many boys are there?
  40. 40.762 + 210 =

Answer key

  1. 133
  2. 63
  3. 795
  4. 701
  5. 694
  6. 386
  7. 782
  8. 612
  9. 332
  10. 215
  11. 909
  12. 71
  13. 273
  14. 570
  15. 333
  16. 352
  17. 845
  18. 758
  19. 214
  20. 408
  21. 343
  22. 929
  23. 625
  24. 723
  25. 675
  26. 573
  27. 156
  28. 527
  29. 946
  30. 959
  31. 719
  32. 799
  33. 782
  34. 301
  35. 827
  36. 43
  37. 813
  38. 377
  39. 310
  40. 972

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