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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 508 · 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. 1.196 + 165 =
  2. 2.A school has 768 children. 183 of them are girls. How many boys are there?
  3. 3.A train has 796 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  4. 4.? − 348 = 68
  5. 5.? − 666 = 190
  6. 6.A school has 988 children. 555 of them are girls. How many boys are there?
  7. 7.351 + 290 =
  8. 8.A school has 251 children. 193 of them are girls. How many boys are there?
  9. 9.363 + ? = 618
  10. 10.A train has 160 people in the front coaches and 553 people in the back coaches. How many people are on the train?
  11. 11.A school has 257 children. 210 of them are girls. How many boys are there?
  12. 12.? − 242 = 19
  13. 13.A train has 441 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  14. 14.556 − ? = 365
  15. 15.A school has 945 children. 293 of them are girls. How many boys are there?
  16. 16.645 + 264 =
  17. 17.974 − 153 =
  18. 18.496 − 281 =
  19. 19.340 − 204 =
  20. 20.298 + 510 =
  21. 21.A train has 446 people in the front coaches and 536 people in the back coaches. How many people are on the train?
  22. 22.203 + 431 =
  23. 23.412 + 171 =
  24. 24.651 − 530 =
  25. 25.743 − 590 =
  26. 26.A train has 676 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  27. 27.? + 284 = 430
  28. 28.807 − 143 =
  29. 29.339 − 233 =
  30. 30.205 − 176 =
  31. 31.A train has 474 people in the front coaches and 302 people in the back coaches. How many people are on the train?
  32. 32.A train has 767 people in the front coaches and 192 people in the back coaches. How many people are on the train?
  33. 33.715 + 103 =
  34. 34.A school has 286 children. 222 of them are girls. How many boys are there?
  35. 35.A train has 478 people in the front coaches and 438 people in the back coaches. How many people are on the train?
  36. 36.A school has 829 children. 525 of them are girls. How many boys are there?
  37. 37.683 − 646 =
  38. 38.373 − 139 =
  39. 39.434 − 123 =
  40. 40.111 + 739 =

Answer key

  1. 361
  2. 585
  3. 897
  4. 416
  5. 856
  6. 433
  7. 641
  8. 58
  9. 255
  10. 713
  11. 47
  12. 261
  13. 574
  14. 191
  15. 652
  16. 909
  17. 821
  18. 215
  19. 136
  20. 808
  21. 982
  22. 634
  23. 583
  24. 121
  25. 153
  26. 780
  27. 146
  28. 664
  29. 106
  30. 29
  31. 776
  32. 959
  33. 818
  34. 64
  35. 916
  36. 304
  37. 37
  38. 234
  39. 311
  40. 850

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