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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 266 · 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 school has 974 children. 214 of them are girls. How many boys are there?
  2. 2.? − 455 = 483
  3. 3.177 + 770 =
  4. 4.414 + 293 =
  5. 5.763 + 115 =
  6. 6.318 + 563 =
  7. 7.567 + 365 =
  8. 8.561 − 249 =
  9. 9.480 − 123 =
  10. 10.487 + ? = 672
  11. 11.393 − ? = 143
  12. 12.A school has 988 children. 539 of them are girls. How many boys are there?
  13. 13.438 + 376 =
  14. 14.A train has 261 people in the front coaches and 557 people in the back coaches. How many people are on the train?
  15. 15.A train has 278 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  16. 16.427 + 444 =
  17. 17.305 + ? = 804
  18. 18.? − 476 = 236
  19. 19.A school has 926 children. 311 of them are girls. How many boys are there?
  20. 20.794 + 151 =
  21. 21.A school has 912 children. 313 of them are girls. How many boys are there?
  22. 22.A train has 517 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  23. 23.? + 644 = 829
  24. 24.? − 125 = 124
  25. 25.956 − 543 =
  26. 26.329 + 340 =
  27. 27.184 + 699 =
  28. 28.740 + 117 =
  29. 29.? − 293 = 439
  30. 30.? − 171 = 175
  31. 31.A train has 325 people in the front coaches and 346 people in the back coaches. How many people are on the train?
  32. 32.266 + 539 =
  33. 33.802 + 171 =
  34. 34.892 + 102 =
  35. 35.? + 644 = 940
  36. 36.A school has 658 children. 448 of them are girls. How many boys are there?
  37. 37.A train has 608 people in the front coaches and 379 people in the back coaches. How many people are on the train?
  38. 38.269 + ? = 428
  39. 39.533 − 222 =
  40. 40.A train has 293 people in the front coaches and 145 people in the back coaches. How many people are on the train?

Answer key

  1. 760
  2. 938
  3. 947
  4. 707
  5. 878
  6. 881
  7. 932
  8. 312
  9. 357
  10. 185
  11. 250
  12. 449
  13. 814
  14. 818
  15. 554
  16. 871
  17. 499
  18. 712
  19. 615
  20. 945
  21. 599
  22. 630
  23. 185
  24. 249
  25. 413
  26. 669
  27. 883
  28. 857
  29. 732
  30. 346
  31. 671
  32. 805
  33. 973
  34. 994
  35. 296
  36. 210
  37. 987
  38. 159
  39. 311
  40. 438

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