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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 730 · 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.A school has 881 children. 483 of them are girls. How many boys are there?
  2. 2.A school has 732 children. 232 of them are girls. How many boys are there?
  3. 3.121 + 335 =
  4. 4.A school has 658 children. 573 of them are girls. How many boys are there?
  5. 5.A school has 889 children. 815 of them are girls. How many boys are there?
  6. 6.? + 213 = 424
  7. 7.458 − ? = 149
  8. 8.A train has 741 people in the front coaches and 256 people in the back coaches. How many people are on the train?
  9. 9.408 − 237 =
  10. 10.? + 475 = 595
  11. 11.893 − ? = 733
  12. 12.221 + 216 =
  13. 13.? + 197 = 329
  14. 14.621 − 554 =
  15. 15.546 + 367 =
  16. 16.413 + 210 =
  17. 17.779 + ? = 996
  18. 18.A train has 188 people in the front coaches and 547 people in the back coaches. How many people are on the train?
  19. 19.A school has 256 children. 252 of them are girls. How many boys are there?
  20. 20.452 + 433 =
  21. 21.212 + 399 =
  22. 22.A train has 614 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  23. 23.363 − 351 =
  24. 24.A train has 546 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  25. 25.887 − 645 =
  26. 26.A school has 373 children. 151 of them are girls. How many boys are there?
  27. 27.A train has 462 people in the front coaches and 165 people in the back coaches. How many people are on the train?
  28. 28.217 + ? = 493
  29. 29.773 + 171 =
  30. 30.A train has 293 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  31. 31.A train has 505 people in the front coaches and 302 people in the back coaches. How many people are on the train?
  32. 32.240 − ? = 117
  33. 33.? − 187 = 267
  34. 34.A train has 599 people in the front coaches and 317 people in the back coaches. How many people are on the train?
  35. 35.104 + 538 =
  36. 36.? + 156 = 808
  37. 37.474 + 128 =
  38. 38.A school has 251 children. 123 of them are girls. How many boys are there?
  39. 39.823 − 256 =
  40. 40.288 − ? = 2

Answer key

  1. 398
  2. 500
  3. 456
  4. 85
  5. 74
  6. 211
  7. 309
  8. 997
  9. 171
  10. 120
  11. 160
  12. 437
  13. 132
  14. 67
  15. 913
  16. 623
  17. 217
  18. 735
  19. 4
  20. 885
  21. 611
  22. 756
  23. 12
  24. 747
  25. 242
  26. 222
  27. 627
  28. 276
  29. 944
  30. 403
  31. 807
  32. 123
  33. 454
  34. 916
  35. 642
  36. 652
  37. 602
  38. 128
  39. 567
  40. 286

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