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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 288 · 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 293 children. 225 of them are girls. How many boys are there?
  2. 2.A school has 297 children. 276 of them are girls. How many boys are there?
  3. 3.A school has 642 children. 176 of them are girls. How many boys are there?
  4. 4.509 + 359 =
  5. 5.301 + 544 =
  6. 6.A school has 432 children. 281 of them are girls. How many boys are there?
  7. 7.150 + ? = 799
  8. 8.893 − 673 =
  9. 9.792 + ? = 916
  10. 10.A train has 799 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  11. 11.A train has 709 people in the front coaches and 216 people in the back coaches. How many people are on the train?
  12. 12.? − 407 = 582
  13. 13.? − 138 = 142
  14. 14.? + 213 = 710
  15. 15.A train has 173 people in the front coaches and 273 people in the back coaches. How many people are on the train?
  16. 16.696 + ? = 866
  17. 17.A train has 370 people in the front coaches and 457 people in the back coaches. How many people are on the train?
  18. 18.A school has 441 children. 122 of them are girls. How many boys are there?
  19. 19.A school has 682 children. 667 of them are girls. How many boys are there?
  20. 20.269 − 172 =
  21. 21.A train has 231 people in the front coaches and 240 people in the back coaches. How many people are on the train?
  22. 22.A school has 804 children. 366 of them are girls. How many boys are there?
  23. 23.? − 361 = 60
  24. 24.954 − ? = 140
  25. 25.490 + 242 =
  26. 26.? + 148 = 375
  27. 27.196 + 264 =
  28. 28.692 + 157 =
  29. 29.A school has 601 children. 473 of them are girls. How many boys are there?
  30. 30.A school has 277 children. 200 of them are girls. How many boys are there?
  31. 31.720 − 247 =
  32. 32.861 − 235 =
  33. 33.A train has 291 people in the front coaches and 194 people in the back coaches. How many people are on the train?
  34. 34.307 + ? = 441
  35. 35.A school has 563 children. 295 of them are girls. How many boys are there?
  36. 36.274 − ? = 57
  37. 37.286 − 116 =
  38. 38.? + 417 = 969
  39. 39.431 + ? = 801
  40. 40.246 + ? = 430

Answer key

  1. 68
  2. 21
  3. 466
  4. 868
  5. 845
  6. 151
  7. 649
  8. 220
  9. 124
  10. 985
  11. 925
  12. 989
  13. 280
  14. 497
  15. 446
  16. 170
  17. 827
  18. 319
  19. 15
  20. 97
  21. 471
  22. 438
  23. 421
  24. 814
  25. 732
  26. 227
  27. 460
  28. 849
  29. 128
  30. 77
  31. 473
  32. 626
  33. 485
  34. 134
  35. 268
  36. 217
  37. 170
  38. 552
  39. 370
  40. 184

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