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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 37 · 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. 1.953 − 813 =
  2. 2.203 + 233 =
  3. 3.? + 688 = 803
  4. 4.A train has 294 people in the front coaches and 236 people in the back coaches. How many people are on the train?
  5. 5.282 − ? = 157
  6. 6.A school has 761 children. 108 of them are girls. How many boys are there?
  7. 7.232 + ? = 558
  8. 8.511 − 187 =
  9. 9.A train has 798 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  10. 10.918 − 514 =
  11. 11.375 − 247 =
  12. 12.A school has 884 children. 660 of them are girls. How many boys are there?
  13. 13.345 + ? = 970
  14. 14.576 + 255 =
  15. 15.241 − 224 =
  16. 16.825 − ? = 530
  17. 17.A school has 638 children. 224 of them are girls. How many boys are there?
  18. 18.? + 779 = 904
  19. 19.211 − ? = 100
  20. 20.? − 395 = 198
  21. 21.250 − 150 =
  22. 22.A school has 620 children. 522 of them are girls. How many boys are there?
  23. 23.A train has 889 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  24. 24.A train has 274 people in the front coaches and 607 people in the back coaches. How many people are on the train?
  25. 25.683 − 399 =
  26. 26.A school has 700 children. 154 of them are girls. How many boys are there?
  27. 27.246 + 117 =
  28. 28.369 + 192 =
  29. 29.865 + 124 =
  30. 30.873 − ? = 576
  31. 31.438 − ? = 282
  32. 32.A school has 936 children. 891 of them are girls. How many boys are there?
  33. 33.277 + ? = 996
  34. 34.109 + 781 =
  35. 35.A school has 801 children. 649 of them are girls. How many boys are there?
  36. 36.A school has 849 children. 172 of them are girls. How many boys are there?
  37. 37.389 + 512 =
  38. 38.616 − 329 =
  39. 39.? + 218 = 466
  40. 40.A school has 557 children. 367 of them are girls. How many boys are there?

Answer key

  1. 140
  2. 436
  3. 115
  4. 530
  5. 125
  6. 653
  7. 326
  8. 324
  9. 918
  10. 404
  11. 128
  12. 224
  13. 625
  14. 831
  15. 17
  16. 295
  17. 414
  18. 125
  19. 111
  20. 593
  21. 100
  22. 98
  23. 990
  24. 881
  25. 284
  26. 546
  27. 363
  28. 561
  29. 989
  30. 297
  31. 156
  32. 45
  33. 719
  34. 890
  35. 152
  36. 677
  37. 901
  38. 287
  39. 248
  40. 190

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