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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 632 · 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. 1.364 + 191 =
  2. 2.580 + ? = 687
  3. 3.595 + 357 =
  4. 4.534 − 175 =
  5. 5.113 + 872 =
  6. 6.735 + 104 =
  7. 7.A train has 599 people in the front coaches and 364 people in the back coaches. How many people are on the train?
  8. 8.A school has 432 children. 351 of them are girls. How many boys are there?
  9. 9.A school has 595 children. 280 of them are girls. How many boys are there?
  10. 10.807 − ? = 462
  11. 11.? + 285 = 660
  12. 12.323 + 129 =
  13. 13.A train has 653 people in the front coaches and 215 people in the back coaches. How many people are on the train?
  14. 14.A school has 829 children. 705 of them are girls. How many boys are there?
  15. 15.A train has 456 people in the front coaches and 534 people in the back coaches. How many people are on the train?
  16. 16.174 + ? = 780
  17. 17.250 + 742 =
  18. 18.307 − 150 =
  19. 19.? − 497 = 222
  20. 20.? + 732 = 996
  21. 21.A school has 356 children. 126 of them are girls. How many boys are there?
  22. 22.? − 353 = 484
  23. 23.188 + ? = 772
  24. 24.980 − 293 =
  25. 25.150 + ? = 326
  26. 26.105 + ? = 564
  27. 27.? − 120 = 375
  28. 28.107 + ? = 918
  29. 29.A school has 318 children. 310 of them are girls. How many boys are there?
  30. 30.128 + 278 =
  31. 31.261 − ? = 6
  32. 32.A train has 471 people in the front coaches and 450 people in the back coaches. How many people are on the train?
  33. 33.? − 847 = 80
  34. 34.836 + ? = 979
  35. 35.? − 543 = 305
  36. 36.102 + 233 =
  37. 37.734 − 361 =
  38. 38.302 − 111 =
  39. 39.A train has 321 people in the front coaches and 560 people in the back coaches. How many people are on the train?
  40. 40.205 − ? = 74

Answer key

  1. 555
  2. 107
  3. 952
  4. 359
  5. 985
  6. 839
  7. 963
  8. 81
  9. 315
  10. 345
  11. 375
  12. 452
  13. 868
  14. 124
  15. 990
  16. 606
  17. 992
  18. 157
  19. 719
  20. 264
  21. 230
  22. 837
  23. 584
  24. 687
  25. 176
  26. 459
  27. 495
  28. 811
  29. 8
  30. 406
  31. 255
  32. 921
  33. 927
  34. 143
  35. 848
  36. 335
  37. 373
  38. 191
  39. 881
  40. 131

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