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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 520 · 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. 1.548 + 364 =
  2. 2.680 + ? = 896
  3. 3.227 − 195 =
  4. 4.523 − 356 =
  5. 5.368 − 245 =
  6. 6.A school has 483 children. 404 of them are girls. How many boys are there?
  7. 7.A school has 872 children. 243 of them are girls. How many boys are there?
  8. 8.A school has 360 children. 313 of them are girls. How many boys are there?
  9. 9.A school has 565 children. 493 of them are girls. How many boys are there?
  10. 10.A train has 260 people in the front coaches and 537 people in the back coaches. How many people are on the train?
  11. 11.234 − ? = 106
  12. 12.? + 520 = 944
  13. 13.681 − 371 =
  14. 14.179 + 483 =
  15. 15.A school has 499 children. 453 of them are girls. How many boys are there?
  16. 16.A school has 905 children. 343 of them are girls. How many boys are there?
  17. 17.337 − ? = 100
  18. 18.A school has 937 children. 168 of them are girls. How many boys are there?
  19. 19.346 − 334 =
  20. 20.A train has 819 people in the front coaches and 179 people in the back coaches. How many people are on the train?
  21. 21.A school has 716 children. 245 of them are girls. How many boys are there?
  22. 22.415 − ? = 31
  23. 23.439 + ? = 544
  24. 24.A school has 437 children. 211 of them are girls. How many boys are there?
  25. 25.655 + 317 =
  26. 26.A train has 174 people in the front coaches and 216 people in the back coaches. How many people are on the train?
  27. 27.A school has 405 children. 143 of them are girls. How many boys are there?
  28. 28.370 + 359 =
  29. 29.A train has 153 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  30. 30.976 − 408 =
  31. 31.? − 112 = 110
  32. 32.A train has 390 people in the front coaches and 297 people in the back coaches. How many people are on the train?
  33. 33.A school has 524 children. 483 of them are girls. How many boys are there?
  34. 34.550 + 342 =
  35. 35.A train has 367 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  36. 36.A train has 329 people in the front coaches and 453 people in the back coaches. How many people are on the train?
  37. 37.737 − 100 =
  38. 38.240 − 157 =
  39. 39.A school has 926 children. 195 of them are girls. How many boys are there?
  40. 40.238 − ? = 44

Answer key

  1. 912
  2. 216
  3. 32
  4. 167
  5. 123
  6. 79
  7. 629
  8. 47
  9. 72
  10. 797
  11. 128
  12. 424
  13. 310
  14. 662
  15. 46
  16. 562
  17. 237
  18. 769
  19. 12
  20. 998
  21. 471
  22. 384
  23. 105
  24. 226
  25. 972
  26. 390
  27. 262
  28. 729
  29. 269
  30. 568
  31. 222
  32. 687
  33. 41
  34. 892
  35. 468
  36. 782
  37. 637
  38. 83
  39. 731
  40. 194

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