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Divisibility rules - PowerPoint PPT Presentation


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Divisibility rules. 3 and 9 . Yesterday …. You learned the rules for divisibility A number that can be equally shared in whole parts is divisible by 2 if the number is even ( ends in 0,2,4,6,8,) Is divisible by 5 is it ends in 5 or 0 Is divisible by 10 is it ends in 0

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Presentation Transcript
yesterday
Yesterday ….
  • You learned the rules for divisibility
  • A number that can be equally shared in whole parts is divisible by
  • 2 if the number is even ( ends in 0,2,4,6,8,)
  • Is divisible by 5 is it ends in 5 or 0
  • Is divisible by 10 is it ends in 0
  • Today we will learn the rules for divisibility by 3 and 9.
there are similarities in rules for 3 9
There are similarities in rules for 3 & 9
  • To find out is something is divisible by 9, add the digits.
  • 8217
  • Add 8+2+1+7=18
  • 18 is divisible by 9, therefore 8217 is divisible by 9.
  • To find out if something is divisible by 3 , add the digits.
  • 117
  • Add 1 +1+ 7=9
  • 9 is divisible by 3, therefore 117 is divisible by 3.
check out this you tube link
Check out this you tube link

Please put your head phones in …

  • 3 and 9 use the digit sum rule . Now it’s time for an annoying rap about it !
  • http://www.youtube.com/watch?v=1ffvCtNZN9Q
ready for practice
Ready for practice ?
  • Put your answers in your coil note book.
  • Which numbers are divisible by 3 ? Which by 9 ?
  • 117 b) 216
  • c) 4125 d)729
  • e) 8217 f)12 024
try this explanation
Try this explanation

http://www.youtube.com/watch?v=_-IbZ5Ih_nU&NR=1&feature=fvwp

ready for more practice
Ready for more practice ?
  • http://www.funtrivia.com/playquiz/quiz2534921d05d68.html
  • http://www.oswego.org/ocsd-web/match/dragflip.asp?filename=slanedivrules
  • Turn to page 12 in the grade 7 MMS brown text book to see and study the divisibility rules.