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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 258 · 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. 1.296 + ? = 423
  2. 2.A train has 668 people in the front coaches and 274 people in the back coaches. How many people are on the train?
  3. 3.? − 335 = 528
  4. 4.237 − 178 =
  5. 5.539 + 118 =
  6. 6.897 − ? = 797
  7. 7.A school has 363 children. 276 of them are girls. How many boys are there?
  8. 8.A train has 278 people in the front coaches and 305 people in the back coaches. How many people are on the train?
  9. 9.619 + 378 =
  10. 10.A train has 376 people in the front coaches and 607 people in the back coaches. How many people are on the train?
  11. 11.881 + 109 =
  12. 12.A train has 416 people in the front coaches and 351 people in the back coaches. How many people are on the train?
  13. 13.253 + 626 =
  14. 14.479 + 360 =
  15. 15.? + 884 = 998
  16. 16.406 − ? = 293
  17. 17.A school has 994 children. 226 of them are girls. How many boys are there?
  18. 18.? − 138 = 139
  19. 19.862 + 131 =
  20. 20.543 + 415 =
  21. 21.A train has 861 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  22. 22.A train has 794 people in the front coaches and 172 people in the back coaches. How many people are on the train?
  23. 23.970 − 407 =
  24. 24.416 + 408 =
  25. 25.A school has 839 children. 175 of them are girls. How many boys are there?
  26. 26.247 + 128 =
  27. 27.937 − 212 =
  28. 28.A train has 452 people in the front coaches and 381 people in the back coaches. How many people are on the train?
  29. 29.? − 327 = 610
  30. 30.? − 686 = 292
  31. 31.875 + ? = 981
  32. 32.A train has 787 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  33. 33.397 + 430 =
  34. 34.361 + ? = 738
  35. 35.? + 722 = 906
  36. 36.A school has 638 children. 386 of them are girls. How many boys are there?
  37. 37.A school has 838 children. 544 of them are girls. How many boys are there?
  38. 38.A school has 504 children. 250 of them are girls. How many boys are there?
  39. 39.? − 105 = 319
  40. 40.? + 335 = 560

Answer key

  1. 127
  2. 942
  3. 863
  4. 59
  5. 657
  6. 100
  7. 87
  8. 583
  9. 997
  10. 983
  11. 990
  12. 767
  13. 879
  14. 839
  15. 114
  16. 113
  17. 768
  18. 277
  19. 993
  20. 958
  21. 990
  22. 966
  23. 563
  24. 824
  25. 664
  26. 375
  27. 725
  28. 833
  29. 937
  30. 978
  31. 106
  32. 910
  33. 827
  34. 377
  35. 184
  36. 252
  37. 294
  38. 254
  39. 424
  40. 225

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