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Divisibility rules

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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Divisibility rules

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  1. Divisibility rules 3 and 9

  2. 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.

  3. 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.

  4. 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

  5. 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

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

  7. 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.

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