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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 654 · 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. 1.594 − 190 =
  2. 2.? + 252 = 928
  3. 3.363 + 321 =
  4. 4.651 − 124 =
  5. 5.834 − 278 =
  6. 6.A school has 811 children. 691 of them are girls. How many boys are there?
  7. 7.897 + 100 =
  8. 8.866 + 132 =
  9. 9.A train has 715 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  10. 10.A school has 456 children. 419 of them are girls. How many boys are there?
  11. 11.A train has 110 people in the front coaches and 869 people in the back coaches. How many people are on the train?
  12. 12.? − 100 = 364
  13. 13.A train has 178 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  14. 14.735 + 128 =
  15. 15.A train has 668 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  16. 16.317 + 561 =
  17. 17.495 + 471 =
  18. 18.A train has 627 people in the front coaches and 324 people in the back coaches. How many people are on the train?
  19. 19.A school has 684 children. 251 of them are girls. How many boys are there?
  20. 20.191 + 765 =
  21. 21.? + 215 = 350
  22. 22.531 − 195 =
  23. 23.A school has 675 children. 103 of them are girls. How many boys are there?
  24. 24.445 + 382 =
  25. 25.106 + 684 =
  26. 26.174 + 392 =
  27. 27.? − 473 = 126
  28. 28.338 − ? = 115
  29. 29.A school has 801 children. 167 of them are girls. How many boys are there?
  30. 30.319 − 244 =
  31. 31.563 + 431 =
  32. 32.A school has 239 children. 231 of them are girls. How many boys are there?
  33. 33.? − 390 = 282
  34. 34.804 − 754 =
  35. 35.? + 731 = 849
  36. 36.? − 245 = 454
  37. 37.761 − 438 =
  38. 38.A train has 780 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  39. 39.A train has 210 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  40. 40.215 − 187 =

Answer key

  1. 404
  2. 676
  3. 684
  4. 527
  5. 556
  6. 120
  7. 997
  8. 998
  9. 854
  10. 37
  11. 979
  12. 464
  13. 349
  14. 863
  15. 803
  16. 878
  17. 966
  18. 951
  19. 433
  20. 956
  21. 135
  22. 336
  23. 572
  24. 827
  25. 790
  26. 566
  27. 599
  28. 223
  29. 634
  30. 75
  31. 994
  32. 8
  33. 672
  34. 50
  35. 118
  36. 699
  37. 323
  38. 901
  39. 366
  40. 28

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