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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 254 · 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. 1.699 + 220 =
  2. 2.231 + 557 =
  3. 3.? − 262 = 294
  4. 4.A train has 738 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  5. 5.? − 328 = 607
  6. 6.833 − 360 =
  7. 7.545 + 345 =
  8. 8.766 − ? = 17
  9. 9.628 + 140 =
  10. 10.528 − 140 =
  11. 11.459 − 235 =
  12. 12.A school has 614 children. 299 of them are girls. How many boys are there?
  13. 13.592 − 280 =
  14. 14.? + 898 = 999
  15. 15.A school has 853 children. 429 of them are girls. How many boys are there?
  16. 16.A school has 223 children. 213 of them are girls. How many boys are there?
  17. 17.A school has 542 children. 456 of them are girls. How many boys are there?
  18. 18.252 − 222 =
  19. 19.? + 305 = 635
  20. 20.463 + ? = 840
  21. 21.A school has 971 children. 828 of them are girls. How many boys are there?
  22. 22.116 + ? = 658
  23. 23.A train has 323 people in the front coaches and 631 people in the back coaches. How many people are on the train?
  24. 24.803 + 121 =
  25. 25.? + 384 = 897
  26. 26.888 − ? = 660
  27. 27.417 − 218 =
  28. 28.716 − 695 =
  29. 29.? − 329 = 407
  30. 30.A school has 255 children. 131 of them are girls. How many boys are there?
  31. 31.344 + ? = 518
  32. 32.880 − 504 =
  33. 33.A school has 884 children. 262 of them are girls. How many boys are there?
  34. 34.A train has 201 people in the front coaches and 271 people in the back coaches. How many people are on the train?
  35. 35.218 − 215 =
  36. 36.A school has 353 children. 172 of them are girls. How many boys are there?
  37. 37.647 − 510 =
  38. 38.574 + ? = 717
  39. 39.414 + 145 =
  40. 40.A train has 231 people in the front coaches and 170 people in the back coaches. How many people are on the train?

Answer key

  1. 919
  2. 788
  3. 556
  4. 868
  5. 935
  6. 473
  7. 890
  8. 749
  9. 768
  10. 388
  11. 224
  12. 315
  13. 312
  14. 101
  15. 424
  16. 10
  17. 86
  18. 30
  19. 330
  20. 377
  21. 143
  22. 542
  23. 954
  24. 924
  25. 513
  26. 228
  27. 199
  28. 21
  29. 736
  30. 124
  31. 174
  32. 376
  33. 622
  34. 472
  35. 3
  36. 181
  37. 137
  38. 143
  39. 559
  40. 401

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