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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 187 · 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. 1.557 + 358 =
  2. 2.A train has 228 people in the front coaches and 396 people in the back coaches. How many people are on the train?
  3. 3.A school has 681 children. 662 of them are girls. How many boys are there?
  4. 4.? − 521 = 346
  5. 5.? − 673 = 85
  6. 6.? + 882 = 988
  7. 7.A school has 586 children. 517 of them are girls. How many boys are there?
  8. 8.? − 184 = 806
  9. 9.A school has 816 children. 349 of them are girls. How many boys are there?
  10. 10.211 − 103 =
  11. 11.954 − ? = 246
  12. 12.726 + 227 =
  13. 13.? + 823 = 979
  14. 14.381 + 395 =
  15. 15.A school has 555 children. 319 of them are girls. How many boys are there?
  16. 16.410 − 156 =
  17. 17.443 + 425 =
  18. 18.? − 161 = 61
  19. 19.331 + ? = 877
  20. 20.A school has 477 children. 470 of them are girls. How many boys are there?
  21. 21.338 − 168 =
  22. 22.112 + 476 =
  23. 23.389 + 514 =
  24. 24.439 − 211 =
  25. 25.A school has 488 children. 162 of them are girls. How many boys are there?
  26. 26.282 − 136 =
  27. 27.301 + 195 =
  28. 28.610 − 371 =
  29. 29.115 + 874 =
  30. 30.A train has 699 people in the front coaches and 163 people in the back coaches. How many people are on the train?
  31. 31.165 + ? = 399
  32. 32.665 − ? = 190
  33. 33.? − 292 = 567
  34. 34.670 + 194 =
  35. 35.A train has 191 people in the front coaches and 277 people in the back coaches. How many people are on the train?
  36. 36.277 + 500 =
  37. 37.270 − 107 =
  38. 38.465 − 433 =
  39. 39.A school has 597 children. 434 of them are girls. How many boys are there?
  40. 40.770 + ? = 900

Answer key

  1. 915
  2. 624
  3. 19
  4. 867
  5. 758
  6. 106
  7. 69
  8. 990
  9. 467
  10. 108
  11. 708
  12. 953
  13. 156
  14. 776
  15. 236
  16. 254
  17. 868
  18. 222
  19. 546
  20. 7
  21. 170
  22. 588
  23. 903
  24. 228
  25. 326
  26. 146
  27. 496
  28. 239
  29. 989
  30. 862
  31. 234
  32. 475
  33. 859
  34. 864
  35. 468
  36. 777
  37. 163
  38. 32
  39. 163
  40. 130

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