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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 879 · 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.? + 245 = 578
  2. 2.481 + 172 =
  3. 3.A train has 115 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  4. 4.607 − ? = 322
  5. 5.392 + 183 =
  6. 6.623 − ? = 81
  7. 7.A train has 129 people in the front coaches and 387 people in the back coaches. How many people are on the train?
  8. 8.A train has 288 people in the front coaches and 698 people in the back coaches. How many people are on the train?
  9. 9.A train has 783 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  10. 10.A school has 893 children. 770 of them are girls. How many boys are there?
  11. 11.A school has 489 children. 428 of them are girls. How many boys are there?
  12. 12.A school has 351 children. 284 of them are girls. How many boys are there?
  13. 13.A train has 514 people in the front coaches and 431 people in the back coaches. How many people are on the train?
  14. 14.938 − 301 =
  15. 15.713 − 636 =
  16. 16.? + 715 = 844
  17. 17.? + 668 = 909
  18. 18.? + 623 = 806
  19. 19.? − 306 = 2
  20. 20.587 + 200 =
  21. 21.697 − 690 =
  22. 22.632 + 114 =
  23. 23.995 − 895 =
  24. 24.A train has 658 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  25. 25.A train has 485 people in the front coaches and 235 people in the back coaches. How many people are on the train?
  26. 26.416 − 216 =
  27. 27.? + 472 = 767
  28. 28.630 − ? = 14
  29. 29.510 + 116 =
  30. 30.563 − 316 =
  31. 31.A school has 578 children. 131 of them are girls. How many boys are there?
  32. 32.651 + ? = 774
  33. 33.A school has 294 children. 228 of them are girls. How many boys are there?
  34. 34.? − 121 = 180
  35. 35.? + 303 = 468
  36. 36.? + 240 = 451
  37. 37.783 − ? = 659
  38. 38.A school has 244 children. 144 of them are girls. How many boys are there?
  39. 39.A school has 890 children. 123 of them are girls. How many boys are there?
  40. 40.A school has 984 children. 119 of them are girls. How many boys are there?

Answer key

  1. 333
  2. 653
  3. 264
  4. 285
  5. 575
  6. 542
  7. 516
  8. 986
  9. 888
  10. 123
  11. 61
  12. 67
  13. 945
  14. 637
  15. 77
  16. 129
  17. 241
  18. 183
  19. 308
  20. 787
  21. 7
  22. 746
  23. 100
  24. 773
  25. 720
  26. 200
  27. 295
  28. 616
  29. 626
  30. 247
  31. 447
  32. 123
  33. 66
  34. 301
  35. 165
  36. 211
  37. 124
  38. 100
  39. 767
  40. 865

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