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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 795 · 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. 1.538 + 197 =
  2. 2.A school has 292 children. 170 of them are girls. How many boys are there?
  3. 3.225 + 261 =
  4. 4.828 + 101 =
  5. 5.A train has 665 people in the front coaches and 254 people in the back coaches. How many people are on the train?
  6. 6.470 − 328 =
  7. 7.933 − 837 =
  8. 8.A train has 149 people in the front coaches and 470 people in the back coaches. How many people are on the train?
  9. 9.145 + 141 =
  10. 10.953 − 262 =
  11. 11.384 − ? = 257
  12. 12.A train has 182 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  13. 13.? + 277 = 502
  14. 14.? − 546 = 42
  15. 15.A train has 627 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  16. 16.601 + 250 =
  17. 17.660 − ? = 250
  18. 18.A train has 442 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  19. 19.435 − 135 =
  20. 20.A school has 307 children. 103 of them are girls. How many boys are there?
  21. 21.? + 475 = 932
  22. 22.? + 843 = 995
  23. 23.302 + 261 =
  24. 24.552 + ? = 823
  25. 25.209 − 180 =
  26. 26.? + 647 = 978
  27. 27.? + 647 = 850
  28. 28.577 − 385 =
  29. 29.538 − 344 =
  30. 30.A train has 446 people in the front coaches and 311 people in the back coaches. How many people are on the train?
  31. 31.A school has 612 children. 574 of them are girls. How many boys are there?
  32. 32.A train has 807 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  33. 33.A train has 252 people in the front coaches and 511 people in the back coaches. How many people are on the train?
  34. 34.191 + 468 =
  35. 35.? − 399 = 29
  36. 36.583 − ? = 401
  37. 37.A school has 329 children. 200 of them are girls. How many boys are there?
  38. 38.282 + ? = 415
  39. 39.836 − 511 =
  40. 40.509 + 323 =

Answer key

  1. 735
  2. 122
  3. 486
  4. 929
  5. 919
  6. 142
  7. 96
  8. 619
  9. 286
  10. 691
  11. 127
  12. 448
  13. 225
  14. 588
  15. 749
  16. 851
  17. 410
  18. 591
  19. 300
  20. 204
  21. 457
  22. 152
  23. 563
  24. 271
  25. 29
  26. 331
  27. 203
  28. 192
  29. 194
  30. 757
  31. 38
  32. 917
  33. 763
  34. 659
  35. 428
  36. 182
  37. 129
  38. 133
  39. 325
  40. 832

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