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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 166 · 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. 1.219 − 168 =
  2. 2.585 + 271 =
  3. 3.374 − 359 =
  4. 4.769 + 106 =
  5. 5.A train has 461 people in the front coaches and 416 people in the back coaches. How many people are on the train?
  6. 6.279 + ? = 943
  7. 7.142 + ? = 674
  8. 8.318 + 211 =
  9. 9.A train has 140 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  10. 10.? − 134 = 269
  11. 11.217 + 699 =
  12. 12.135 + 263 =
  13. 13.521 − 328 =
  14. 14.A school has 472 children. 309 of them are girls. How many boys are there?
  15. 15.706 − 148 =
  16. 16.690 + 185 =
  17. 17.892 + ? = 995
  18. 18.491 + ? = 882
  19. 19.927 − 113 =
  20. 20.829 + 109 =
  21. 21.A train has 643 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  22. 22.? + 668 = 925
  23. 23.A school has 953 children. 732 of them are girls. How many boys are there?
  24. 24.A train has 560 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  25. 25.309 + 677 =
  26. 26.938 − 359 =
  27. 27.A school has 852 children. 433 of them are girls. How many boys are there?
  28. 28.A train has 730 people in the front coaches and 217 people in the back coaches. How many people are on the train?
  29. 29.222 − 109 =
  30. 30.A school has 886 children. 239 of them are girls. How many boys are there?
  31. 31.836 − 670 =
  32. 32.A train has 617 people in the front coaches and 324 people in the back coaches. How many people are on the train?
  33. 33.475 − ? = 28
  34. 34.824 + ? = 975
  35. 35.853 − 529 =
  36. 36.A train has 588 people in the front coaches and 307 people in the back coaches. How many people are on the train?
  37. 37.121 + 607 =
  38. 38.409 − 346 =
  39. 39.A school has 637 children. 601 of them are girls. How many boys are there?
  40. 40.394 − ? = 36

Answer key

  1. 51
  2. 856
  3. 15
  4. 875
  5. 877
  6. 664
  7. 532
  8. 529
  9. 402
  10. 403
  11. 916
  12. 398
  13. 193
  14. 163
  15. 558
  16. 875
  17. 103
  18. 391
  19. 814
  20. 938
  21. 951
  22. 257
  23. 221
  24. 666
  25. 986
  26. 579
  27. 419
  28. 947
  29. 113
  30. 647
  31. 166
  32. 941
  33. 447
  34. 151
  35. 324
  36. 895
  37. 728
  38. 63
  39. 36
  40. 358

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