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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 137 · 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 648 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  2. 2.? − 363 = 511
  3. 3.682 + ? = 831
  4. 4.653 − 383 =
  5. 5.803 − 801 =
  6. 6.499 + ? = 989
  7. 7.301 − 122 =
  8. 8.798 + ? = 982
  9. 9.A train has 282 people in the front coaches and 522 people in the back coaches. How many people are on the train?
  10. 10.A train has 862 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  11. 11.623 − ? = 67
  12. 12.745 + 168 =
  13. 13.952 − 613 =
  14. 14.229 − 143 =
  15. 15.119 + 509 =
  16. 16.613 + 165 =
  17. 17.366 − ? = 168
  18. 18.228 + 239 =
  19. 19.576 − ? = 474
  20. 20.256 − ? = 92
  21. 21.329 + ? = 549
  22. 22.? − 232 = 224
  23. 23.391 + ? = 952
  24. 24.613 − 502 =
  25. 25.? + 523 = 835
  26. 26.278 + 155 =
  27. 27.656 − 527 =
  28. 28.827 + ? = 984
  29. 29.714 − 192 =
  30. 30.A school has 846 children. 723 of them are girls. How many boys are there?
  31. 31.A train has 312 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  32. 32.307 − 209 =
  33. 33.A train has 450 people in the front coaches and 421 people in the back coaches. How many people are on the train?
  34. 34.A train has 267 people in the front coaches and 568 people in the back coaches. How many people are on the train?
  35. 35.175 + 734 =
  36. 36.A school has 443 children. 219 of them are girls. How many boys are there?
  37. 37.126 + ? = 414
  38. 38.? − 225 = 125
  39. 39.368 + 480 =
  40. 40.920 − ? = 33

Answer key

  1. 819
  2. 874
  3. 149
  4. 270
  5. 2
  6. 490
  7. 179
  8. 184
  9. 804
  10. 967
  11. 556
  12. 913
  13. 339
  14. 86
  15. 628
  16. 778
  17. 198
  18. 467
  19. 102
  20. 164
  21. 220
  22. 456
  23. 561
  24. 111
  25. 312
  26. 433
  27. 129
  28. 157
  29. 522
  30. 123
  31. 498
  32. 98
  33. 871
  34. 835
  35. 909
  36. 224
  37. 288
  38. 350
  39. 848
  40. 887

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