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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 249 · 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.A school has 854 children. 191 of them are girls. How many boys are there?
  2. 2.359 + 350 =
  3. 3.A school has 351 children. 258 of them are girls. How many boys are there?
  4. 4.879 − 776 =
  5. 5.116 + ? = 940
  6. 6.A train has 238 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  7. 7.A train has 804 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  8. 8.275 + 691 =
  9. 9.868 + 104 =
  10. 10.A school has 704 children. 526 of them are girls. How many boys are there?
  11. 11.858 − ? = 556
  12. 12.555 − 322 =
  13. 13.A train has 823 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  14. 14.? + 815 = 951
  15. 15.383 + 179 =
  16. 16.? + 236 = 378
  17. 17.? + 476 = 732
  18. 18.785 − 776 =
  19. 19.924 − ? = 115
  20. 20.100 + ? = 626
  21. 21.A school has 625 children. 421 of them are girls. How many boys are there?
  22. 22.? − 436 = 239
  23. 23.A train has 801 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  24. 24.? + 443 = 921
  25. 25.567 − 459 =
  26. 26.? − 163 = 49
  27. 27.526 − ? = 216
  28. 28.816 + 154 =
  29. 29.A train has 874 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  30. 30.? − 208 = 115
  31. 31.? + 564 = 862
  32. 32.A train has 544 people in the front coaches and 243 people in the back coaches. How many people are on the train?
  33. 33.645 + 198 =
  34. 34.351 − 298 =
  35. 35.258 + 606 =
  36. 36.A school has 767 children. 614 of them are girls. How many boys are there?
  37. 37.283 − 244 =
  38. 38.891 − ? = 505
  39. 39.805 − 395 =
  40. 40.123 + 552 =

Answer key

  1. 663
  2. 709
  3. 93
  4. 103
  5. 824
  6. 428
  7. 995
  8. 966
  9. 972
  10. 178
  11. 302
  12. 233
  13. 941
  14. 136
  15. 562
  16. 142
  17. 256
  18. 9
  19. 809
  20. 526
  21. 204
  22. 675
  23. 982
  24. 478
  25. 108
  26. 212
  27. 310
  28. 970
  29. 976
  30. 323
  31. 298
  32. 787
  33. 843
  34. 53
  35. 864
  36. 153
  37. 39
  38. 386
  39. 410
  40. 675

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