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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 589 · 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 490 children. 309 of them are girls. How many boys are there?
  2. 2.391 − 226 =
  3. 3.? + 536 = 790
  4. 4.511 + 179 =
  5. 5.390 − ? = 23
  6. 6.210 − 114 =
  7. 7.388 − 209 =
  8. 8.898 − ? = 771
  9. 9.298 − 136 =
  10. 10.525 + ? = 900
  11. 11.817 + ? = 972
  12. 12.147 + 572 =
  13. 13.562 + 220 =
  14. 14.320 − 173 =
  15. 15.911 − 805 =
  16. 16.856 + 118 =
  17. 17.821 + 122 =
  18. 18.? + 312 = 483
  19. 19.? − 181 = 70
  20. 20.? + 183 = 913
  21. 21.A train has 561 people in the front coaches and 429 people in the back coaches. How many people are on the train?
  22. 22.241 + 463 =
  23. 23.458 + ? = 628
  24. 24.694 + ? = 928
  25. 25.701 − 445 =
  26. 26.421 + 502 =
  27. 27.861 − 814 =
  28. 28.667 − ? = 435
  29. 29.804 + 161 =
  30. 30.A school has 829 children. 172 of them are girls. How many boys are there?
  31. 31.A train has 493 people in the front coaches and 316 people in the back coaches. How many people are on the train?
  32. 32.A school has 232 children. 186 of them are girls. How many boys are there?
  33. 33.187 + ? = 574
  34. 34.A school has 399 children. 137 of them are girls. How many boys are there?
  35. 35.? + 304 = 733
  36. 36.A school has 417 children. 132 of them are girls. How many boys are there?
  37. 37.A train has 889 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  38. 38.A train has 800 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  39. 39.849 − ? = 60
  40. 40.A school has 253 children. 105 of them are girls. How many boys are there?

Answer key

  1. 181
  2. 165
  3. 254
  4. 690
  5. 367
  6. 96
  7. 179
  8. 127
  9. 162
  10. 375
  11. 155
  12. 719
  13. 782
  14. 147
  15. 106
  16. 974
  17. 943
  18. 171
  19. 251
  20. 730
  21. 990
  22. 704
  23. 170
  24. 234
  25. 256
  26. 923
  27. 47
  28. 232
  29. 965
  30. 657
  31. 809
  32. 46
  33. 387
  34. 262
  35. 429
  36. 285
  37. 991
  38. 918
  39. 789
  40. 148

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