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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 420 · 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 821 people in the front coaches and 170 people in the back coaches. How many people are on the train?
  2. 2.550 − 431 =
  3. 3.639 + 210 =
  4. 4.A school has 417 children. 191 of them are girls. How many boys are there?
  5. 5.? − 484 = 236
  6. 6.302 − 170 =
  7. 7.578 + ? = 986
  8. 8.395 − 376 =
  9. 9.A train has 713 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  10. 10.A school has 819 children. 374 of them are girls. How many boys are there?
  11. 11.405 + 166 =
  12. 12.572 − ? = 462
  13. 13.? − 275 = 250
  14. 14.? − 337 = 513
  15. 15.957 − ? = 622
  16. 16.A school has 398 children. 113 of them are girls. How many boys are there?
  17. 17.265 + 241 =
  18. 18.A school has 611 children. 287 of them are girls. How many boys are there?
  19. 19.546 + 114 =
  20. 20.750 + 180 =
  21. 21.214 + 348 =
  22. 22.? − 307 = 210
  23. 23.A school has 823 children. 242 of them are girls. How many boys are there?
  24. 24.231 − 204 =
  25. 25.A school has 697 children. 641 of them are girls. How many boys are there?
  26. 26.A train has 275 people in the front coaches and 710 people in the back coaches. How many people are on the train?
  27. 27.523 + ? = 677
  28. 28.107 + ? = 625
  29. 29.? − 195 = 780
  30. 30.859 + 135 =
  31. 31.A school has 425 children. 133 of them are girls. How many boys are there?
  32. 32.A train has 134 people in the front coaches and 517 people in the back coaches. How many people are on the train?
  33. 33.A train has 156 people in the front coaches and 562 people in the back coaches. How many people are on the train?
  34. 34.A school has 323 children. 302 of them are girls. How many boys are there?
  35. 35.839 − 811 =
  36. 36.581 + ? = 996
  37. 37.A train has 491 people in the front coaches and 319 people in the back coaches. How many people are on the train?
  38. 38.866 + 103 =
  39. 39.534 + 461 =
  40. 40.663 + 123 =

Answer key

  1. 991
  2. 119
  3. 849
  4. 226
  5. 720
  6. 132
  7. 408
  8. 19
  9. 815
  10. 445
  11. 571
  12. 110
  13. 525
  14. 850
  15. 335
  16. 285
  17. 506
  18. 324
  19. 660
  20. 930
  21. 562
  22. 517
  23. 581
  24. 27
  25. 56
  26. 985
  27. 154
  28. 518
  29. 975
  30. 994
  31. 292
  32. 651
  33. 718
  34. 21
  35. 28
  36. 415
  37. 810
  38. 969
  39. 995
  40. 786

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