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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 250 · 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.? − 671 = 163
  2. 2.A school has 335 children. 301 of them are girls. How many boys are there?
  3. 3.? − 421 = 430
  4. 4.A school has 692 children. 197 of them are girls. How many boys are there?
  5. 5.? − 263 = 310
  6. 6.A school has 634 children. 298 of them are girls. How many boys are there?
  7. 7.A school has 740 children. 653 of them are girls. How many boys are there?
  8. 8.A train has 772 people in the front coaches and 211 people in the back coaches. How many people are on the train?
  9. 9.A school has 699 children. 290 of them are girls. How many boys are there?
  10. 10.? − 441 = 178
  11. 11.387 − ? = 137
  12. 12.637 − ? = 522
  13. 13.213 − ? = 30
  14. 14.644 + 325 =
  15. 15.390 − 191 =
  16. 16.A school has 983 children. 616 of them are girls. How many boys are there?
  17. 17.A train has 716 people in the front coaches and 175 people in the back coaches. How many people are on the train?
  18. 18.264 − ? = 85
  19. 19.856 + 118 =
  20. 20.A school has 329 children. 125 of them are girls. How many boys are there?
  21. 21.333 + 148 =
  22. 22.? − 359 = 193
  23. 23.? + 423 = 714
  24. 24.683 + 176 =
  25. 25.? − 584 = 94
  26. 26.A school has 676 children. 613 of them are girls. How many boys are there?
  27. 27.? − 321 = 439
  28. 28.660 + 296 =
  29. 29.? + 268 = 505
  30. 30.? + 292 = 512
  31. 31.? − 107 = 173
  32. 32.A school has 831 children. 504 of them are girls. How many boys are there?
  33. 33.874 + 107 =
  34. 34.657 + ? = 899
  35. 35.667 − ? = 414
  36. 36.? − 124 = 495
  37. 37.567 + ? = 753
  38. 38.? − 215 = 294
  39. 39.194 + 585 =
  40. 40.? + 272 = 908

Answer key

  1. 834
  2. 34
  3. 851
  4. 495
  5. 573
  6. 336
  7. 87
  8. 983
  9. 409
  10. 619
  11. 250
  12. 115
  13. 183
  14. 969
  15. 199
  16. 367
  17. 891
  18. 179
  19. 974
  20. 204
  21. 481
  22. 552
  23. 291
  24. 859
  25. 678
  26. 63
  27. 760
  28. 956
  29. 237
  30. 220
  31. 280
  32. 327
  33. 981
  34. 242
  35. 253
  36. 619
  37. 186
  38. 509
  39. 779
  40. 636

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