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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 259 · 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 train has 388 people in the front coaches and 570 people in the back coaches. How many people are on the train?
  2. 2.442 + 535 =
  3. 3.? − 629 = 51
  4. 4.A school has 819 children. 504 of them are girls. How many boys are there?
  5. 5.A train has 200 people in the front coaches and 300 people in the back coaches. How many people are on the train?
  6. 6.827 − 530 =
  7. 7.256 + 405 =
  8. 8.998 − 960 =
  9. 9.A school has 593 children. 222 of them are girls. How many boys are there?
  10. 10.423 − ? = 269
  11. 11.? − 555 = 366
  12. 12.765 + ? = 912
  13. 13.224 + 586 =
  14. 14.A school has 242 children. 122 of them are girls. How many boys are there?
  15. 15.? − 205 = 102
  16. 16.609 + 119 =
  17. 17.396 − 199 =
  18. 18.978 − 265 =
  19. 19.A train has 344 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  20. 20.A school has 942 children. 255 of them are girls. How many boys are there?
  21. 21.A train has 683 people in the front coaches and 172 people in the back coaches. How many people are on the train?
  22. 22.A school has 328 children. 297 of them are girls. How many boys are there?
  23. 23.390 − 275 =
  24. 24.A school has 569 children. 152 of them are girls. How many boys are there?
  25. 25.469 + 400 =
  26. 26.A train has 610 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  27. 27.869 − ? = 217
  28. 28.? − 180 = 731
  29. 29.? − 310 = 91
  30. 30.425 + ? = 904
  31. 31.284 − 152 =
  32. 32.A train has 581 people in the front coaches and 304 people in the back coaches. How many people are on the train?
  33. 33.527 + 388 =
  34. 34.? − 117 = 310
  35. 35.A train has 116 people in the front coaches and 273 people in the back coaches. How many people are on the train?
  36. 36.A school has 405 children. 175 of them are girls. How many boys are there?
  37. 37.A train has 686 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  38. 38.697 − 433 =
  39. 39.183 + ? = 609
  40. 40.A school has 738 children. 678 of them are girls. How many boys are there?

Answer key

  1. 958
  2. 977
  3. 680
  4. 315
  5. 500
  6. 297
  7. 661
  8. 38
  9. 371
  10. 154
  11. 921
  12. 147
  13. 810
  14. 120
  15. 307
  16. 728
  17. 197
  18. 713
  19. 472
  20. 687
  21. 855
  22. 31
  23. 115
  24. 417
  25. 869
  26. 743
  27. 652
  28. 911
  29. 401
  30. 479
  31. 132
  32. 885
  33. 915
  34. 427
  35. 389
  36. 230
  37. 797
  38. 264
  39. 426
  40. 60

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