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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 965 · 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.? + 262 = 876
  2. 2.324 − ? = 136
  3. 3.A train has 133 people in the front coaches and 242 people in the back coaches. How many people are on the train?
  4. 4.483 + ? = 706
  5. 5.A school has 859 children. 386 of them are girls. How many boys are there?
  6. 6.367 + ? = 755
  7. 7.622 − 122 =
  8. 8.A school has 947 children. 545 of them are girls. How many boys are there?
  9. 9.? − 275 = 104
  10. 10.? + 666 = 919
  11. 11.572 − ? = 306
  12. 12.A school has 869 children. 171 of them are girls. How many boys are there?
  13. 13.? + 190 = 815
  14. 14.890 + 100 =
  15. 15.? − 310 = 625
  16. 16.? − 783 = 82
  17. 17.622 − 159 =
  18. 18.271 + ? = 745
  19. 19.A train has 703 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  20. 20.A school has 414 children. 148 of them are girls. How many boys are there?
  21. 21.265 + ? = 850
  22. 22.721 − 217 =
  23. 23.344 + 630 =
  24. 24.695 + 284 =
  25. 25.A train has 611 people in the front coaches and 240 people in the back coaches. How many people are on the train?
  26. 26.A school has 764 children. 123 of them are girls. How many boys are there?
  27. 27.396 + ? = 952
  28. 28.A school has 730 children. 424 of them are girls. How many boys are there?
  29. 29.? + 687 = 934
  30. 30.A train has 572 people in the front coaches and 215 people in the back coaches. How many people are on the train?
  31. 31.865 − ? = 230
  32. 32.A train has 865 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  33. 33.705 + 122 =
  34. 34.A train has 605 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  35. 35.? + 229 = 469
  36. 36.172 + ? = 933
  37. 37.747 + 244 =
  38. 38.156 + ? = 374
  39. 39.205 − ? = 14
  40. 40.905 − 234 =

Answer key

  1. 614
  2. 188
  3. 375
  4. 223
  5. 473
  6. 388
  7. 500
  8. 402
  9. 379
  10. 253
  11. 266
  12. 698
  13. 625
  14. 990
  15. 935
  16. 865
  17. 463
  18. 474
  19. 845
  20. 266
  21. 585
  22. 504
  23. 974
  24. 979
  25. 851
  26. 641
  27. 556
  28. 306
  29. 247
  30. 787
  31. 635
  32. 992
  33. 827
  34. 766
  35. 240
  36. 761
  37. 991
  38. 218
  39. 191
  40. 671

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