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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 618 · 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.? + 483 = 890
  2. 2.A train has 377 people in the front coaches and 406 people in the back coaches. How many people are on the train?
  3. 3.882 + 113 =
  4. 4.137 + 554 =
  5. 5.A school has 571 children. 220 of them are girls. How many boys are there?
  6. 6.A train has 152 people in the front coaches and 548 people in the back coaches. How many people are on the train?
  7. 7.164 + 180 =
  8. 8.765 − 478 =
  9. 9.355 + 240 =
  10. 10.338 − 327 =
  11. 11.468 + 249 =
  12. 12.352 − ? = 53
  13. 13.274 − 111 =
  14. 14.771 − 484 =
  15. 15.A school has 330 children. 222 of them are girls. How many boys are there?
  16. 16.539 − ? = 307
  17. 17.A school has 921 children. 258 of them are girls. How many boys are there?
  18. 18.A train has 571 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  19. 19.A train has 819 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  20. 20.305 − 174 =
  21. 21.809 + 151 =
  22. 22.117 + 560 =
  23. 23.146 + 355 =
  24. 24.511 + ? = 920
  25. 25.355 − ? = 199
  26. 26.616 − 280 =
  27. 27.A train has 118 people in the front coaches and 560 people in the back coaches. How many people are on the train?
  28. 28.751 − 263 =
  29. 29.A school has 319 children. 168 of them are girls. How many boys are there?
  30. 30.777 + 212 =
  31. 31.? + 551 = 827
  32. 32.251 + 334 =
  33. 33.? − 555 = 168
  34. 34.? − 335 = 191
  35. 35.A train has 785 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  36. 36.? + 758 = 905
  37. 37.874 + 109 =
  38. 38.A train has 705 people in the front coaches and 236 people in the back coaches. How many people are on the train?
  39. 39.354 − ? = 244
  40. 40.828 − 269 =

Answer key

  1. 407
  2. 783
  3. 995
  4. 691
  5. 351
  6. 700
  7. 344
  8. 287
  9. 595
  10. 11
  11. 717
  12. 299
  13. 163
  14. 287
  15. 108
  16. 232
  17. 663
  18. 692
  19. 931
  20. 131
  21. 960
  22. 677
  23. 501
  24. 409
  25. 156
  26. 336
  27. 678
  28. 488
  29. 151
  30. 989
  31. 276
  32. 585
  33. 723
  34. 526
  35. 886
  36. 147
  37. 983
  38. 941
  39. 110
  40. 559

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