Divisibility Rules - Quick ways to determine if a number is divisible by another number.
Rule for 2 - All even numbers are divisible by 2.
- Any number ending in 0,2,4,6,8
eg.
- 4 is divisible by 2
- 280 is divisible by 2
- 2971 is not divisible by 2
Rule for 5 - Any number that ends in 5 or 0.
eg.
- 155 divisible by 5
- 8974 is not divisible by 5
Rule for 10 - Any number that ends in 0.
eg.
- 1070 is divisible by 10
- 27367 is not divisible by 10
- 360.4 is not divisible by 10
- 364.0 is not divisible by 10
Quotient - Is the result of a division question.
eg.
- 12 divided by 2 = 6. Quotient is 6
Rule for 4 - Look at the last 2 digits, are they divisible by 2 twice?
eg.
The rule for 4 - If the last 2 digits are divisible by 2 twice, then the number is divisible by 4.
Rule for 8 - If the last 2 digits are divisible by 2 three times, then the number is divisible by 8.
eg.
16 divided by 2 = 8 8 divided by 2 = 4 4 divided by 2 = 2 = yes
18 divided by 2 = 9 9 divided by 2 = 4.5 = no
17948 = 48 divided by 2 = 24 24 divided by 2 = 12 12 divided by 2 = 6 = yes
Rule for 7 - Use calculator. There is no short-cut yet! You should find one and name it after yourself.
Rule for 3 - Add up all the digits until you have a single digit remaining. If that digit is divisible by 3 the number is divisible by 3.
eg.
93 = 9+3 =12 1+2=3 = yes
273 = 2+7+3=12 1+2+3 = yes
1045 = 1+0+4+5=10 1+0=1 = no
Rule for 6 - Any number that is divisible by 2 and 3.
Rule for 9 - Add up all the digits until you have 1 digit. If that digit is 9 the number is divisible by 9.
eg.
18 = 1+8=9 = yes
54 = 5+4=9 = yes
468 = 4+6+8=18 1+8=9 = yes
2345 = 2+3+4+5=14 1+4=5 = no
Rule for 0 - Nothing is divisible by 0.
*If you guys still have problems with Divisibility click on this website* =
http://math.about.com/library/bldivide.htm
Enjoy the video :D
Nice post Raelynn!!! It was very organized and easy to read. Next time you shouldn't use so many colours but other than that great job!!!
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ReplyDeleteGreat post Raelynn, I like how everything is organized! but next time try to not use so many colours, Besides that Great job!
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ReplyDeleteGreat post Raelynn! Your scribe is very neat and organize but i would like it to make your font a little bigger.But your video was good and everything else is seems to fine.Good job!
ReplyDeleteGreat post Raelynn! I like how it's organized. Next time, make your link into a word.
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ReplyDeleteGreat post Raelynn. I like that your scribe is nice and neat. I also like how you changed the colour of the important words. Next time you should make the link into a word.
ReplyDeletegood job Raelynn. I like how you used different colours to stand out. But you should have put the link in a word.
ReplyDeleteGreat job, Raelynn! I liked the different colors of the font so it can stand out, but next time you should put the link in a word. Other than that, you did an awesome job!
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ReplyDeleteGood job. Next time put a link in. I really liked the colours.
ReplyDeleteNice job, Realynn. I really liked how you changed the color of some important words. I also liked the video, picture and link you posted. Next time, try to put the link into a word.
ReplyDeleteVery nice post Realynn. I thought that all of the colors made the post very nice looking. But next time try to put the link on a word.
ReplyDeletenice post Raelynn.i like the video that you posted but mext time you should put the link on a word
ReplyDeleteNice post Raelynn. I liked how you changed the font colors and the video helped me.
ReplyDeleteNice post Raelynn! I really liked the video,it really helped me.Next time you should put the link as a word.Very nice job!
ReplyDeleteGood job realynn! Good link but maybe next time put the link as a word!
ReplyDeleteGood post Raelynn. I really liked how you made a lot of the words stand out !
ReplyDeleteGood post i really liked it. the video helped me.
ReplyDeleteGOod post, but i think u should put the link as words, other than that nice job
ReplyDeleteNice Post Raelynn, I liked how you made some of the important words stand out!
ReplyDeleteNice post but the font was a little small!
ReplyDelete