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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 126 · 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 train has 651 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  2. 2.508 − 145 =
  3. 3.A school has 649 children. 144 of them are girls. How many boys are there?
  4. 4.654 + 105 =
  5. 5.541 − 506 =
  6. 6.? + 549 = 920
  7. 7.? − 265 = 631
  8. 8.591 − 196 =
  9. 9.813 + 120 =
  10. 10.511 − ? = 288
  11. 11.A train has 679 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  12. 12.372 + 146 =
  13. 13.A school has 280 children. 264 of them are girls. How many boys are there?
  14. 14.591 + 309 =
  15. 15.307 − 261 =
  16. 16.A school has 356 children. 180 of them are girls. How many boys are there?
  17. 17.305 + ? = 859
  18. 18.? + 545 = 651
  19. 19.? − 277 = 136
  20. 20.908 − 231 =
  21. 21.227 − 112 =
  22. 22.A school has 472 children. 272 of them are girls. How many boys are there?
  23. 23.A school has 933 children. 841 of them are girls. How many boys are there?
  24. 24.A school has 278 children. 236 of them are girls. How many boys are there?
  25. 25.A train has 875 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  26. 26.? − 196 = 191
  27. 27.675 + ? = 959
  28. 28.334 − 179 =
  29. 29.309 + 198 =
  30. 30.208 + ? = 492
  31. 31.592 + 163 =
  32. 32.? + 854 = 996
  33. 33.? − 713 = 275
  34. 34.859 + 113 =
  35. 35.756 − 305 =
  36. 36.455 − ? = 237
  37. 37.A school has 442 children. 214 of them are girls. How many boys are there?
  38. 38.A school has 500 children. 128 of them are girls. How many boys are there?
  39. 39.618 + 131 =
  40. 40.? + 812 = 931

Answer key

  1. 755
  2. 363
  3. 505
  4. 759
  5. 35
  6. 371
  7. 896
  8. 395
  9. 933
  10. 223
  11. 814
  12. 518
  13. 16
  14. 900
  15. 46
  16. 176
  17. 554
  18. 106
  19. 413
  20. 677
  21. 115
  22. 200
  23. 92
  24. 42
  25. 993
  26. 387
  27. 284
  28. 155
  29. 507
  30. 284
  31. 755
  32. 142
  33. 988
  34. 972
  35. 451
  36. 218
  37. 228
  38. 372
  39. 749
  40. 119

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