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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 751 · 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 823 children. 217 of them are girls. How many boys are there?
  2. 2.A school has 265 children. 103 of them are girls. How many boys are there?
  3. 3.491 − 423 =
  4. 4.557 − 349 =
  5. 5.A train has 710 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  6. 6.236 − ? = 64
  7. 7.? − 545 = 190
  8. 8.261 + 129 =
  9. 9.527 − 496 =
  10. 10.? − 217 = 325
  11. 11.A train has 504 people in the front coaches and 279 people in the back coaches. How many people are on the train?
  12. 12.A school has 494 children. 293 of them are girls. How many boys are there?
  13. 13.270 + 523 =
  14. 14.737 + 127 =
  15. 15.? − 384 = 99
  16. 16.331 − ? = 226
  17. 17.A school has 218 children. 107 of them are girls. How many boys are there?
  18. 18.A school has 635 children. 426 of them are girls. How many boys are there?
  19. 19.A train has 362 people in the front coaches and 394 people in the back coaches. How many people are on the train?
  20. 20.669 − 401 =
  21. 21.766 − 410 =
  22. 22.117 + 385 =
  23. 23.A train has 631 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  24. 24.855 + 118 =
  25. 25.622 + ? = 865
  26. 26.A train has 777 people in the front coaches and 206 people in the back coaches. How many people are on the train?
  27. 27.A train has 117 people in the front coaches and 330 people in the back coaches. How many people are on the train?
  28. 28.A school has 722 children. 583 of them are girls. How many boys are there?
  29. 29.? − 260 = 78
  30. 30.398 − ? = 278
  31. 31.717 − ? = 332
  32. 32.171 + 573 =
  33. 33.A train has 775 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  34. 34.? − 607 = 27
  35. 35.210 + ? = 421
  36. 36.A school has 750 children. 248 of them are girls. How many boys are there?
  37. 37.A school has 470 children. 191 of them are girls. How many boys are there?
  38. 38.180 + 778 =
  39. 39.561 − 371 =
  40. 40.438 − 105 =

Answer key

  1. 606
  2. 162
  3. 68
  4. 208
  5. 810
  6. 172
  7. 735
  8. 390
  9. 31
  10. 542
  11. 783
  12. 201
  13. 793
  14. 864
  15. 483
  16. 105
  17. 111
  18. 209
  19. 756
  20. 268
  21. 356
  22. 502
  23. 752
  24. 973
  25. 243
  26. 983
  27. 447
  28. 139
  29. 338
  30. 120
  31. 385
  32. 744
  33. 902
  34. 634
  35. 211
  36. 502
  37. 279
  38. 958
  39. 190
  40. 333

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