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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 621 · 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 school has 308 children. 146 of them are girls. How many boys are there?
  2. 2.500 + 222 =
  3. 3.A train has 144 people in the front coaches and 223 people in the back coaches. How many people are on the train?
  4. 4.356 + 251 =
  5. 5.760 + 208 =
  6. 6.A train has 234 people in the front coaches and 748 people in the back coaches. How many people are on the train?
  7. 7.A school has 977 children. 146 of them are girls. How many boys are there?
  8. 8.A school has 819 children. 567 of them are girls. How many boys are there?
  9. 9.901 − 356 =
  10. 10.676 − ? = 322
  11. 11.724 − ? = 96
  12. 12.494 + ? = 625
  13. 13.997 − 477 =
  14. 14.A train has 334 people in the front coaches and 513 people in the back coaches. How many people are on the train?
  15. 15.503 + 145 =
  16. 16.752 + ? = 875
  17. 17.? + 711 = 910
  18. 18.A train has 840 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  19. 19.510 − 491 =
  20. 20.A school has 661 children. 456 of them are girls. How many boys are there?
  21. 21.? − 108 = 209
  22. 22.566 + ? = 976
  23. 23.A train has 466 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  24. 24.A school has 720 children. 299 of them are girls. How many boys are there?
  25. 25.? − 503 = 402
  26. 26.368 + 282 =
  27. 27.A school has 967 children. 807 of them are girls. How many boys are there?
  28. 28.912 − 451 =
  29. 29.355 − ? = 173
  30. 30.? − 247 = 252
  31. 31.785 − ? = 474
  32. 32.A train has 858 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  33. 33.A train has 889 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  34. 34.169 + 452 =
  35. 35.A train has 704 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  36. 36.751 − ? = 632
  37. 37.? + 879 = 980
  38. 38.? + 427 = 530
  39. 39.A train has 176 people in the front coaches and 305 people in the back coaches. How many people are on the train?
  40. 40.379 − 301 =

Answer key

  1. 162
  2. 722
  3. 367
  4. 607
  5. 968
  6. 982
  7. 831
  8. 252
  9. 545
  10. 354
  11. 628
  12. 131
  13. 520
  14. 847
  15. 648
  16. 123
  17. 199
  18. 945
  19. 19
  20. 205
  21. 317
  22. 410
  23. 591
  24. 421
  25. 905
  26. 650
  27. 160
  28. 461
  29. 182
  30. 499
  31. 311
  32. 966
  33. 991
  34. 621
  35. 828
  36. 119
  37. 101
  38. 103
  39. 481
  40. 78

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