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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 784 · 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.? − 569 = 45
  2. 2.A train has 433 people in the front coaches and 268 people in the back coaches. How many people are on the train?
  3. 3.959 − 651 =
  4. 4.644 − ? = 254
  5. 5.872 + ? = 979
  6. 6.230 + 668 =
  7. 7.293 + 313 =
  8. 8.120 + 397 =
  9. 9.324 − 253 =
  10. 10.A school has 393 children. 375 of them are girls. How many boys are there?
  11. 11.816 + 174 =
  12. 12.? − 564 = 325
  13. 13.A school has 211 children. 181 of them are girls. How many boys are there?
  14. 14.262 + 505 =
  15. 15.590 − 362 =
  16. 16.A train has 285 people in the front coaches and 430 people in the back coaches. How many people are on the train?
  17. 17.? + 252 = 983
  18. 18.408 − 353 =
  19. 19.A school has 437 children. 256 of them are girls. How many boys are there?
  20. 20.279 − 273 =
  21. 21.A school has 226 children. 219 of them are girls. How many boys are there?
  22. 22.? − 153 = 546
  23. 23.? + 732 = 960
  24. 24.221 − 136 =
  25. 25.? + 703 = 924
  26. 26.626 + ? = 786
  27. 27.A school has 438 children. 430 of them are girls. How many boys are there?
  28. 28.A train has 307 people in the front coaches and 626 people in the back coaches. How many people are on the train?
  29. 29.840 + 110 =
  30. 30.703 − 683 =
  31. 31.604 + 267 =
  32. 32.840 − 828 =
  33. 33.312 + 242 =
  34. 34.758 − 438 =
  35. 35.768 + ? = 978
  36. 36.446 + ? = 945
  37. 37.A train has 713 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  38. 38.A school has 397 children. 134 of them are girls. How many boys are there?
  39. 39.102 + 318 =
  40. 40.917 − 308 =

Answer key

  1. 614
  2. 701
  3. 308
  4. 390
  5. 107
  6. 898
  7. 606
  8. 517
  9. 71
  10. 18
  11. 990
  12. 889
  13. 30
  14. 767
  15. 228
  16. 715
  17. 731
  18. 55
  19. 181
  20. 6
  21. 7
  22. 699
  23. 228
  24. 85
  25. 221
  26. 160
  27. 8
  28. 933
  29. 950
  30. 20
  31. 871
  32. 12
  33. 554
  34. 320
  35. 210
  36. 499
  37. 989
  38. 263
  39. 420
  40. 609

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