Long Division

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A demonstration of long division

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Long Division

  1. 1. Old-fashioned long division<br />1 7<br />8 7 9 1<br />
  2. 2. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />
  3. 3. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />7<br />14<br />21<br />28<br />35<br />42<br />49<br />56<br />63<br />70<br />[1] - Compare it with the 7 times-table<br />
  4. 4. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />+10<br />+20<br />+30<br />+40<br />+50<br />+60<br />+70<br />+80<br />+90<br />+100<br />7<br />14<br />21<br />28<br />35<br />42<br />49<br />56<br />63<br />70<br />[1] - Compare it with the 7 times-table<br />
  5. 5. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />[1] - Compare it with the 7 times-table<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />+10<br />+20<br />+30<br />+40<br />+50<br />+60<br />+70<br />+80<br />+90<br />+100<br />7<br />14<br />21<br />28<br />35<br />42<br />49<br />56<br />63<br />70<br />
  6. 6. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />[2] – Repeatedly add 17’s. <br />17 = 20 – 3<br />
  7. 7. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />[2] – Repeatedly add 17’s. <br />17 = 20 – 3<br />Increase the front by 2 and decrease the back by 3<br />
  8. 8. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />[2] – Repeatedly add 17’s. <br />17 = 20 – 3<br />Increase the front by 2 and decrease the back by 3<br />
  9. 9. Old-fashioned long division<br />We need the 17 times-table.<br />This can be obtained easily in a couple of ways:<br />1 7<br />8 7 9 1<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />[2] – Repeatedly add 17’s. <br />17 = 20 – 3<br />Increase the front by 2 and decrease the back by 3<br />Get these two values by simple adding 17.<br />
  10. 10. Old-fashioned long division<br />1 7<br />8 7 9 1<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />
  11. 11. Old-fashioned long division<br />1 7<br />8 7 9 1<br />_<br />8 50 0<br />50 0<br />2 9 1<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br /> 500<br />
  12. 12. Old-fashioned long division<br />1 7<br />8 7 9 1<br />_<br />8 50 0<br />50 0<br />2 9 1<br />_<br />1 70<br />10<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />1 2 1<br /> 510<br />
  13. 13. Old-fashioned long division<br />1 7<br />8 7 9 1<br />_<br />8 50 0<br />50 0<br />2 9 1<br />_<br />1 70<br />10<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />1 2 1<br />_<br />1 1 9<br />7<br />2<br /> 517<br />
  14. 14. Old-fashioned long division<br />1 7<br />8 7 9 1<br />_<br />8 50 0<br />50 0<br />2 9 1<br />_<br />1 70<br />10<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />1 2 1<br />_<br />1 1 9<br />7<br />2. 0<br />_<br />1. 7<br />0.1<br />0. 3<br /> 517.1<br />
  15. 15. Old-fashioned long division<br />1 7<br />8 7 9 1<br />_<br />8 5 0 0<br />5 0 0<br />2 9 1<br />_<br />1 7 0<br />1 0<br />17<br />34<br />51<br />68<br />85<br />102<br />119<br />136<br />153<br />170<br />1 2 1<br />_<br />1 1 9<br />7<br />2. 0<br />_<br />1. 7<br />0.1<br />0. 3 0<br />_<br />0. 1 7<br />0.01<br />.....Etc<br /> 517.11...<br />
  16. 16. END<br />

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