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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 142 · 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. 1.762 − 453 =
  2. 2.? − 213 = 225
  3. 3.A train has 265 people in the front coaches and 468 people in the back coaches. How many people are on the train?
  4. 4.405 − 135 =
  5. 5.? + 661 = 787
  6. 6.? + 171 = 728
  7. 7.A train has 842 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  8. 8.A train has 555 people in the front coaches and 253 people in the back coaches. How many people are on the train?
  9. 9.633 − 156 =
  10. 10.141 + 288 =
  11. 11.414 + ? = 552
  12. 12.? + 345 = 579
  13. 13.A train has 809 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  14. 14.836 − ? = 15
  15. 15.? + 743 = 864
  16. 16.A train has 196 people in the front coaches and 306 people in the back coaches. How many people are on the train?
  17. 17.A school has 547 children. 298 of them are girls. How many boys are there?
  18. 18.? − 143 = 78
  19. 19.A train has 856 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  20. 20.A school has 606 children. 524 of them are girls. How many boys are there?
  21. 21.A train has 828 people in the front coaches and 168 people in the back coaches. How many people are on the train?
  22. 22.? + 322 = 986
  23. 23.A train has 470 people in the front coaches and 524 people in the back coaches. How many people are on the train?
  24. 24.393 + ? = 605
  25. 25.A train has 699 people in the front coaches and 178 people in the back coaches. How many people are on the train?
  26. 26.319 − ? = 107
  27. 27.A train has 771 people in the front coaches and 119 people in the back coaches. How many people are on the train?
  28. 28.839 + ? = 939
  29. 29.A school has 283 children. 150 of them are girls. How many boys are there?
  30. 30.773 − 292 =
  31. 31.? − 467 = 232
  32. 32.797 + 167 =
  33. 33.? + 784 = 978
  34. 34.228 − 142 =
  35. 35.637 − 563 =
  36. 36.203 + 152 =
  37. 37.? + 777 = 955
  38. 38.778 − 140 =
  39. 39.? − 236 = 23
  40. 40.A train has 301 people in the front coaches and 150 people in the back coaches. How many people are on the train?

Answer key

  1. 309
  2. 438
  3. 733
  4. 270
  5. 126
  6. 557
  7. 972
  8. 808
  9. 477
  10. 429
  11. 138
  12. 234
  13. 930
  14. 821
  15. 121
  16. 502
  17. 249
  18. 221
  19. 972
  20. 82
  21. 996
  22. 664
  23. 994
  24. 212
  25. 877
  26. 212
  27. 890
  28. 100
  29. 133
  30. 481
  31. 699
  32. 964
  33. 194
  34. 86
  35. 74
  36. 355
  37. 178
  38. 638
  39. 259
  40. 451

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