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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 686 · 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 852 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  2. 2.604 + ? = 795
  3. 3.219 + ? = 539
  4. 4.441 + 246 =
  5. 5.? + 748 = 859
  6. 6.882 + 109 =
  7. 7.854 + ? = 995
  8. 8.293 + 326 =
  9. 9.445 + 359 =
  10. 10.745 + ? = 938
  11. 11.A train has 610 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  12. 12.157 + 608 =
  13. 13.247 + ? = 908
  14. 14.A train has 208 people in the front coaches and 593 people in the back coaches. How many people are on the train?
  15. 15.? − 547 = 268
  16. 16.A train has 899 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  17. 17.324 + 343 =
  18. 18.? − 236 = 57
  19. 19.250 − 170 =
  20. 20.A school has 711 children. 258 of them are girls. How many boys are there?
  21. 21.? + 768 = 937
  22. 22.268 + 121 =
  23. 23.? − 604 = 192
  24. 24.412 + 438 =
  25. 25.A school has 918 children. 746 of them are girls. How many boys are there?
  26. 26.A school has 327 children. 138 of them are girls. How many boys are there?
  27. 27.720 − 519 =
  28. 28.409 − 392 =
  29. 29.586 + 135 =
  30. 30.A train has 572 people in the front coaches and 311 people in the back coaches. How many people are on the train?
  31. 31.569 − ? = 430
  32. 32.A school has 379 children. 377 of them are girls. How many boys are there?
  33. 33.375 − 103 =
  34. 34.? + 802 = 972
  35. 35.A train has 607 people in the front coaches and 212 people in the back coaches. How many people are on the train?
  36. 36.? + 473 = 961
  37. 37.692 + 247 =
  38. 38.483 + 466 =
  39. 39.311 + 266 =
  40. 40.580 − 165 =

Answer key

  1. 987
  2. 191
  3. 320
  4. 687
  5. 111
  6. 991
  7. 141
  8. 619
  9. 804
  10. 193
  11. 786
  12. 765
  13. 661
  14. 801
  15. 815
  16. 999
  17. 667
  18. 293
  19. 80
  20. 453
  21. 169
  22. 389
  23. 796
  24. 850
  25. 172
  26. 189
  27. 201
  28. 17
  29. 721
  30. 883
  31. 139
  32. 2
  33. 272
  34. 170
  35. 819
  36. 488
  37. 939
  38. 949
  39. 577
  40. 415

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