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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 923 · 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 682 people in the front coaches and 138 people in the back coaches. How many people are on the train?
  2. 2.A school has 599 children. 313 of them are girls. How many boys are there?
  3. 3.432 − ? = 170
  4. 4.598 + 353 =
  5. 5.284 + ? = 598
  6. 6.A train has 385 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  7. 7.A school has 233 children. 156 of them are girls. How many boys are there?
  8. 8.177 + ? = 414
  9. 9.320 − 100 =
  10. 10.A train has 541 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  11. 11.652 − ? = 26
  12. 12.710 − 582 =
  13. 13.? − 100 = 361
  14. 14.123 + 307 =
  15. 15.A train has 160 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  16. 16.? − 294 = 215
  17. 17.379 − 139 =
  18. 18.A train has 591 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  19. 19.? + 251 = 358
  20. 20.A train has 532 people in the front coaches and 421 people in the back coaches. How many people are on the train?
  21. 21.? − 972 = 24
  22. 22.A train has 111 people in the front coaches and 853 people in the back coaches. How many people are on the train?
  23. 23.170 + 711 =
  24. 24.548 + 137 =
  25. 25.? + 800 = 999
  26. 26.365 + 233 =
  27. 27.162 + 101 =
  28. 28.291 − 227 =
  29. 29.713 + 194 =
  30. 30.423 − ? = 302
  31. 31.641 + 309 =
  32. 32.302 − 129 =
  33. 33.100 + 815 =
  34. 34.752 + ? = 953
  35. 35.477 − ? = 158
  36. 36.777 + 167 =
  37. 37.314 + 682 =
  38. 38.443 − 426 =
  39. 39.A train has 504 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  40. 40.A school has 705 children. 559 of them are girls. How many boys are there?

Answer key

  1. 820
  2. 286
  3. 262
  4. 951
  5. 314
  6. 571
  7. 77
  8. 237
  9. 220
  10. 668
  11. 626
  12. 128
  13. 461
  14. 430
  15. 267
  16. 509
  17. 240
  18. 790
  19. 107
  20. 953
  21. 996
  22. 964
  23. 881
  24. 685
  25. 199
  26. 598
  27. 263
  28. 64
  29. 907
  30. 121
  31. 950
  32. 173
  33. 915
  34. 201
  35. 319
  36. 944
  37. 996
  38. 17
  39. 647
  40. 146

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