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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 677 · 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.? − 206 = 713
  2. 2.A school has 293 children. 102 of them are girls. How many boys are there?
  3. 3.A school has 374 children. 138 of them are girls. How many boys are there?
  4. 4.? − 468 = 429
  5. 5.A school has 270 children. 256 of them are girls. How many boys are there?
  6. 6.556 + 102 =
  7. 7.858 + 112 =
  8. 8.A school has 738 children. 404 of them are girls. How many boys are there?
  9. 9.? − 121 = 278
  10. 10.? − 455 = 524
  11. 11.412 + 108 =
  12. 12.? − 236 = 177
  13. 13.? + 760 = 907
  14. 14.A school has 764 children. 273 of them are girls. How many boys are there?
  15. 15.A school has 362 children. 314 of them are girls. How many boys are there?
  16. 16.A train has 133 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  17. 17.? + 192 = 811
  18. 18.439 + ? = 928
  19. 19.614 − 243 =
  20. 20.? + 168 = 543
  21. 21.? + 586 = 774
  22. 22.981 − ? = 868
  23. 23.752 + ? = 881
  24. 24.? − 503 = 353
  25. 25.654 − 506 =
  26. 26.? − 225 = 83
  27. 27.? − 565 = 349
  28. 28.618 + 352 =
  29. 29.A school has 496 children. 395 of them are girls. How many boys are there?
  30. 30.368 + ? = 536
  31. 31.602 + ? = 760
  32. 32.A train has 432 people in the front coaches and 450 people in the back coaches. How many people are on the train?
  33. 33.A school has 481 children. 323 of them are girls. How many boys are there?
  34. 34.? + 195 = 345
  35. 35.A train has 352 people in the front coaches and 326 people in the back coaches. How many people are on the train?
  36. 36.356 − ? = 1
  37. 37.533 − 454 =
  38. 38.A train has 356 people in the front coaches and 547 people in the back coaches. How many people are on the train?
  39. 39.? − 128 = 578
  40. 40.313 + ? = 942

Answer key

  1. 919
  2. 191
  3. 236
  4. 897
  5. 14
  6. 658
  7. 970
  8. 334
  9. 399
  10. 979
  11. 520
  12. 413
  13. 147
  14. 491
  15. 48
  16. 285
  17. 619
  18. 489
  19. 371
  20. 375
  21. 188
  22. 113
  23. 129
  24. 856
  25. 148
  26. 308
  27. 914
  28. 970
  29. 101
  30. 168
  31. 158
  32. 882
  33. 158
  34. 150
  35. 678
  36. 355
  37. 79
  38. 903
  39. 706
  40. 629

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