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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 836 · 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. 1.256 + 655 =
  2. 2.608 − ? = 317
  3. 3.279 − 244 =
  4. 4.A school has 729 children. 251 of them are girls. How many boys are there?
  5. 5.A train has 613 people in the front coaches and 341 people in the back coaches. How many people are on the train?
  6. 6.A school has 292 children. 285 of them are girls. How many boys are there?
  7. 7.298 − 275 =
  8. 8.568 − 535 =
  9. 9.? + 684 = 829
  10. 10.? + 805 = 930
  11. 11.A train has 111 people in the front coaches and 768 people in the back coaches. How many people are on the train?
  12. 12.A train has 866 people in the front coaches and 126 people in the back coaches. How many people are on the train?
  13. 13.527 + 361 =
  14. 14.758 − 246 =
  15. 15.317 − 118 =
  16. 16.799 + ? = 961
  17. 17.A school has 993 children. 483 of them are girls. How many boys are there?
  18. 18.978 − 745 =
  19. 19.A train has 146 people in the front coaches and 769 people in the back coaches. How many people are on the train?
  20. 20.967 − 560 =
  21. 21.? − 183 = 300
  22. 22.? + 104 = 722
  23. 23.855 + 122 =
  24. 24.A train has 646 people in the front coaches and 346 people in the back coaches. How many people are on the train?
  25. 25.A train has 849 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  26. 26.? − 487 = 43
  27. 27.497 + 196 =
  28. 28.? − 848 = 15
  29. 29.579 + 152 =
  30. 30.A train has 620 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  31. 31.875 + 108 =
  32. 32.878 − 656 =
  33. 33.497 − ? = 17
  34. 34.A train has 342 people in the front coaches and 328 people in the back coaches. How many people are on the train?
  35. 35.299 + 591 =
  36. 36.448 − ? = 229
  37. 37.374 + 408 =
  38. 38.616 + 113 =
  39. 39.? + 804 = 979
  40. 40.320 + 170 =

Answer key

  1. 911
  2. 291
  3. 35
  4. 478
  5. 954
  6. 7
  7. 23
  8. 33
  9. 145
  10. 125
  11. 879
  12. 992
  13. 888
  14. 512
  15. 199
  16. 162
  17. 510
  18. 233
  19. 915
  20. 407
  21. 483
  22. 618
  23. 977
  24. 992
  25. 984
  26. 530
  27. 693
  28. 863
  29. 731
  30. 757
  31. 983
  32. 222
  33. 480
  34. 670
  35. 890
  36. 219
  37. 782
  38. 729
  39. 175
  40. 490

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