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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 230 · 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 135 people in the front coaches and 749 people in the back coaches. How many people are on the train?
  2. 2.611 − 403 =
  3. 3.A train has 487 people in the front coaches and 382 people in the back coaches. How many people are on the train?
  4. 4.790 − 618 =
  5. 5.A train has 550 people in the front coaches and 245 people in the back coaches. How many people are on the train?
  6. 6.536 + 437 =
  7. 7.755 + ? = 878
  8. 8.? + 698 = 801
  9. 9.? + 320 = 876
  10. 10.A school has 512 children. 178 of them are girls. How many boys are there?
  11. 11.334 − 119 =
  12. 12.A school has 514 children. 173 of them are girls. How many boys are there?
  13. 13.A school has 360 children. 224 of them are girls. How many boys are there?
  14. 14.294 − 251 =
  15. 15.206 + 150 =
  16. 16.370 − 166 =
  17. 17.605 − 138 =
  18. 18.547 + 171 =
  19. 19.? − 790 = 124
  20. 20.595 − 312 =
  21. 21.838 + ? = 970
  22. 22.253 + 248 =
  23. 23.858 + 119 =
  24. 24.A school has 329 children. 251 of them are girls. How many boys are there?
  25. 25.? − 145 = 170
  26. 26.A school has 493 children. 131 of them are girls. How many boys are there?
  27. 27.238 − 182 =
  28. 28.? + 172 = 393
  29. 29.540 + ? = 651
  30. 30.? + 215 = 732
  31. 31.434 − 396 =
  32. 32.A train has 244 people in the front coaches and 371 people in the back coaches. How many people are on the train?
  33. 33.A train has 633 people in the front coaches and 168 people in the back coaches. How many people are on the train?
  34. 34.626 + 211 =
  35. 35.? + 586 = 853
  36. 36.434 + ? = 854
  37. 37.? + 779 = 935
  38. 38.710 + 237 =
  39. 39.A train has 501 people in the front coaches and 341 people in the back coaches. How many people are on the train?
  40. 40.990 − 978 =

Answer key

  1. 884
  2. 208
  3. 869
  4. 172
  5. 795
  6. 973
  7. 123
  8. 103
  9. 556
  10. 334
  11. 215
  12. 341
  13. 136
  14. 43
  15. 356
  16. 204
  17. 467
  18. 718
  19. 914
  20. 283
  21. 132
  22. 501
  23. 977
  24. 78
  25. 315
  26. 362
  27. 56
  28. 221
  29. 111
  30. 517
  31. 38
  32. 615
  33. 801
  34. 837
  35. 267
  36. 420
  37. 156
  38. 947
  39. 842
  40. 12

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