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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 904 · 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.? + 864 = 984
  2. 2.A school has 560 children. 116 of them are girls. How many boys are there?
  3. 3.? + 486 = 902
  4. 4.784 − 437 =
  5. 5.361 − ? = 139
  6. 6.931 − 376 =
  7. 7.337 + 648 =
  8. 8.A school has 524 children. 169 of them are girls. How many boys are there?
  9. 9.? − 208 = 123
  10. 10.487 + ? = 678
  11. 11.A school has 700 children. 188 of them are girls. How many boys are there?
  12. 12.873 + 114 =
  13. 13.A school has 282 children. 151 of them are girls. How many boys are there?
  14. 14.748 − 344 =
  15. 15.351 + 586 =
  16. 16.A school has 812 children. 121 of them are girls. How many boys are there?
  17. 17.A train has 826 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  18. 18.154 + 116 =
  19. 19.654 − ? = 139
  20. 20.308 + ? = 613
  21. 21.740 − 730 =
  22. 22.773 − 671 =
  23. 23.A train has 272 people in the front coaches and 424 people in the back coaches. How many people are on the train?
  24. 24.A train has 508 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  25. 25.A school has 904 children. 121 of them are girls. How many boys are there?
  26. 26.658 + 120 =
  27. 27.775 + 165 =
  28. 28.? + 255 = 366
  29. 29.? − 466 = 209
  30. 30.? + 856 = 965
  31. 31.A train has 521 people in the front coaches and 409 people in the back coaches. How many people are on the train?
  32. 32.532 − ? = 26
  33. 33.615 + 254 =
  34. 34.? + 385 = 876
  35. 35.405 − 266 =
  36. 36.A train has 534 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  37. 37.A school has 635 children. 307 of them are girls. How many boys are there?
  38. 38.A train has 178 people in the front coaches and 599 people in the back coaches. How many people are on the train?
  39. 39.298 + 257 =
  40. 40.A train has 753 people in the front coaches and 226 people in the back coaches. How many people are on the train?

Answer key

  1. 120
  2. 444
  3. 416
  4. 347
  5. 222
  6. 555
  7. 985
  8. 355
  9. 331
  10. 191
  11. 512
  12. 987
  13. 131
  14. 404
  15. 937
  16. 691
  17. 929
  18. 270
  19. 515
  20. 305
  21. 10
  22. 102
  23. 696
  24. 635
  25. 783
  26. 778
  27. 940
  28. 111
  29. 675
  30. 109
  31. 930
  32. 506
  33. 869
  34. 491
  35. 139
  36. 796
  37. 328
  38. 777
  39. 555
  40. 979

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