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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 396 · 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. 1.255 − 165 =
  2. 2.678 − 168 =
  3. 3.193 + ? = 980
  4. 4.244 + ? = 915
  5. 5.A school has 246 children. 149 of them are girls. How many boys are there?
  6. 6.759 + 178 =
  7. 7.? + 895 = 998
  8. 8.575 + 400 =
  9. 9.299 − 288 =
  10. 10.A school has 425 children. 411 of them are girls. How many boys are there?
  11. 11.262 + 562 =
  12. 12.845 − 160 =
  13. 13.A train has 399 people in the front coaches and 545 people in the back coaches. How many people are on the train?
  14. 14.A train has 606 people in the front coaches and 355 people in the back coaches. How many people are on the train?
  15. 15.A school has 752 children. 314 of them are girls. How many boys are there?
  16. 16.722 − 537 =
  17. 17.A school has 377 children. 221 of them are girls. How many boys are there?
  18. 18.732 + 253 =
  19. 19.656 + 284 =
  20. 20.453 + ? = 619
  21. 21.A school has 227 children. 141 of them are girls. How many boys are there?
  22. 22.? − 107 = 128
  23. 23.A train has 143 people in the front coaches and 715 people in the back coaches. How many people are on the train?
  24. 24.553 + 185 =
  25. 25.398 + 138 =
  26. 26.A train has 109 people in the front coaches and 810 people in the back coaches. How many people are on the train?
  27. 27.536 − 334 =
  28. 28.670 + 132 =
  29. 29.322 + 271 =
  30. 30.? − 549 = 261
  31. 31.383 + 214 =
  32. 32.643 + 300 =
  33. 33.614 − 200 =
  34. 34.712 − ? = 540
  35. 35.? + 873 = 975
  36. 36.862 − 544 =
  37. 37.A train has 897 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  38. 38.885 + 100 =
  39. 39.676 − ? = 89
  40. 40.A train has 400 people in the front coaches and 366 people in the back coaches. How many people are on the train?

Answer key

  1. 90
  2. 510
  3. 787
  4. 671
  5. 97
  6. 937
  7. 103
  8. 975
  9. 11
  10. 14
  11. 824
  12. 685
  13. 944
  14. 961
  15. 438
  16. 185
  17. 156
  18. 985
  19. 940
  20. 166
  21. 86
  22. 235
  23. 858
  24. 738
  25. 536
  26. 919
  27. 202
  28. 802
  29. 593
  30. 810
  31. 597
  32. 943
  33. 414
  34. 172
  35. 102
  36. 318
  37. 999
  38. 985
  39. 587
  40. 766

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