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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 115 · 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 345 children. 308 of them are girls. How many boys are there?
  2. 2.118 + ? = 234
  3. 3.264 − 234 =
  4. 4.A school has 653 children. 388 of them are girls. How many boys are there?
  5. 5.340 − 331 =
  6. 6.820 − 581 =
  7. 7.443 + ? = 716
  8. 8.A train has 410 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  9. 9.? + 869 = 981
  10. 10.899 + 100 =
  11. 11.A train has 399 people in the front coaches and 575 people in the back coaches. How many people are on the train?
  12. 12.483 + ? = 893
  13. 13.148 + 188 =
  14. 14.A train has 124 people in the front coaches and 739 people in the back coaches. How many people are on the train?
  15. 15.A train has 400 people in the front coaches and 431 people in the back coaches. How many people are on the train?
  16. 16.A train has 423 people in the front coaches and 369 people in the back coaches. How many people are on the train?
  17. 17.275 − 126 =
  18. 18.315 − 218 =
  19. 19.574 + ? = 701
  20. 20.A train has 510 people in the front coaches and 383 people in the back coaches. How many people are on the train?
  21. 21.A school has 348 children. 231 of them are girls. How many boys are there?
  22. 22.897 − 480 =
  23. 23.477 − ? = 317
  24. 24.877 + ? = 986
  25. 25.220 − 174 =
  26. 26.424 − 157 =
  27. 27.249 + 438 =
  28. 28.? − 330 = 73
  29. 29.A train has 853 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  30. 30.? − 175 = 575
  31. 31.A train has 140 people in the front coaches and 328 people in the back coaches. How many people are on the train?
  32. 32.A train has 522 people in the front coaches and 392 people in the back coaches. How many people are on the train?
  33. 33.A train has 864 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  34. 34.A school has 554 children. 173 of them are girls. How many boys are there?
  35. 35.678 + 172 =
  36. 36.A school has 299 children. 283 of them are girls. How many boys are there?
  37. 37.? − 393 = 85
  38. 38.209 − ? = 103
  39. 39.544 + 141 =
  40. 40.215 + 116 =

Answer key

  1. 37
  2. 116
  3. 30
  4. 265
  5. 9
  6. 239
  7. 273
  8. 547
  9. 112
  10. 999
  11. 974
  12. 410
  13. 336
  14. 863
  15. 831
  16. 792
  17. 149
  18. 97
  19. 127
  20. 893
  21. 117
  22. 417
  23. 160
  24. 109
  25. 46
  26. 267
  27. 687
  28. 403
  29. 961
  30. 750
  31. 468
  32. 914
  33. 993
  34. 381
  35. 850
  36. 16
  37. 478
  38. 106
  39. 685
  40. 331

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