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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 457 · 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. 1.851 + 147 =
  2. 2.A train has 774 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  3. 3.? − 188 = 294
  4. 4.880 − 209 =
  5. 5.818 + 163 =
  6. 6.A train has 656 people in the front coaches and 273 people in the back coaches. How many people are on the train?
  7. 7.? − 436 = 198
  8. 8.571 + 101 =
  9. 9.639 + 277 =
  10. 10.819 − 586 =
  11. 11.605 − 357 =
  12. 12.282 − 233 =
  13. 13.? + 378 = 810
  14. 14.767 − 420 =
  15. 15.197 + 431 =
  16. 16.687 + 238 =
  17. 17.993 − 818 =
  18. 18.783 − 431 =
  19. 19.A school has 787 children. 635 of them are girls. How many boys are there?
  20. 20.393 + ? = 527
  21. 21.814 − 733 =
  22. 22.? − 540 = 131
  23. 23.A school has 746 children. 501 of them are girls. How many boys are there?
  24. 24.336 − 225 =
  25. 25.235 − 112 =
  26. 26.826 − ? = 572
  27. 27.A train has 761 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  28. 28.A train has 694 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  29. 29.A school has 473 children. 100 of them are girls. How many boys are there?
  30. 30.? − 263 = 42
  31. 31.A school has 778 children. 562 of them are girls. How many boys are there?
  32. 32.483 − ? = 84
  33. 33.A school has 399 children. 303 of them are girls. How many boys are there?
  34. 34.243 + 699 =
  35. 35.215 + ? = 508
  36. 36.550 + 100 =
  37. 37.A train has 718 people in the front coaches and 256 people in the back coaches. How many people are on the train?
  38. 38.A train has 426 people in the front coaches and 198 people in the back coaches. How many people are on the train?
  39. 39.A school has 281 children. 204 of them are girls. How many boys are there?
  40. 40.366 − 143 =

Answer key

  1. 998
  2. 889
  3. 482
  4. 671
  5. 981
  6. 929
  7. 634
  8. 672
  9. 916
  10. 233
  11. 248
  12. 49
  13. 432
  14. 347
  15. 628
  16. 925
  17. 175
  18. 352
  19. 152
  20. 134
  21. 81
  22. 671
  23. 245
  24. 111
  25. 123
  26. 254
  27. 870
  28. 949
  29. 373
  30. 305
  31. 216
  32. 399
  33. 96
  34. 942
  35. 293
  36. 650
  37. 974
  38. 624
  39. 77
  40. 223

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