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 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. 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. 3 and 9 use the digit sum rule . Now it’s time for an annoying rap about it ! http://www.youtube.c om/watch?v=1ffvCt NZN9Q READY FOR PRACTICE ? Put your answers in your coil note book. Which numbers are divisible by 3 ? Which by 9 ? a) 117 b) 216 c) 4125 d)729 e) 8217 f)12 024 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.