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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 289 · 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. 1.409 + ? = 925
  2. 2.333 + ? = 532
  3. 3.608 − ? = 289
  4. 4.A train has 565 people in the front coaches and 204 people in the back coaches. How many people are on the train?
  5. 5.653 − 646 =
  6. 6.839 − 213 =
  7. 7.A school has 405 children. 327 of them are girls. How many boys are there?
  8. 8.725 + 192 =
  9. 9.513 + ? = 943
  10. 10.A train has 729 people in the front coaches and 157 people in the back coaches. How many people are on the train?
  11. 11.404 − ? = 268
  12. 12.A school has 714 children. 406 of them are girls. How many boys are there?
  13. 13.? − 427 = 13
  14. 14.229 − 170 =
  15. 15.340 − ? = 73
  16. 16.286 − 215 =
  17. 17.A school has 689 children. 435 of them are girls. How many boys are there?
  18. 18.198 + ? = 723
  19. 19.? − 381 = 4
  20. 20.A train has 547 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  21. 21.A school has 767 children. 623 of them are girls. How many boys are there?
  22. 22.A train has 709 people in the front coaches and 170 people in the back coaches. How many people are on the train?
  23. 23.530 + 306 =
  24. 24.915 − ? = 690
  25. 25.? − 168 = 32
  26. 26.A train has 475 people in the front coaches and 225 people in the back coaches. How many people are on the train?
  27. 27.A train has 199 people in the front coaches and 572 people in the back coaches. How many people are on the train?
  28. 28.A train has 619 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  29. 29.664 + 320 =
  30. 30.892 + 101 =
  31. 31.108 + 870 =
  32. 32.913 − 437 =
  33. 33.615 + 236 =
  34. 34.? + 323 = 692
  35. 35.606 + 138 =
  36. 36.224 + 276 =
  37. 37.? + 391 = 507
  38. 38.? + 770 = 955
  39. 39.320 − 227 =
  40. 40.A train has 263 people in the front coaches and 672 people in the back coaches. How many people are on the train?

Answer key

  1. 516
  2. 199
  3. 319
  4. 769
  5. 7
  6. 626
  7. 78
  8. 917
  9. 430
  10. 886
  11. 136
  12. 308
  13. 440
  14. 59
  15. 267
  16. 71
  17. 254
  18. 525
  19. 385
  20. 670
  21. 144
  22. 879
  23. 836
  24. 225
  25. 200
  26. 700
  27. 771
  28. 775
  29. 984
  30. 993
  31. 978
  32. 476
  33. 851
  34. 369
  35. 744
  36. 500
  37. 116
  38. 185
  39. 93
  40. 935

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