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Divisibility Rules for 6 th grade Math. What’s the point?. These rules let you test if one number can be evenly divided by another, without having to do too much calculation!. When will you need to use the rules?. Divisibility rules can be used: to find out if a number is prime or composite

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Presentation Transcript
what s the point
What’s the point?

These rules let you test if one number can be evenly divided by another, without having to do too much calculation!

when will you need to use the rules
When will you need to use the rules?

Divisibility rules can be used:

  • to find out if a number is prime or composite
  • to help find factors of a number
  • to find GCF and LCM when dealing with fractions
divisibility rule for
Divisibility rule for

A number is divisible by2,ifthe ones digit is divisible by 2

For example:

746 is divisible by 2…

because 6 is divisible by 2

6÷2=3 (hint: any even # is divisible by 2!)

divisibility rule for1
Divisibility rule for

A number is divisible by 3, if the sum of the digits is divisible by 3

For example:

12,321 is divisible by 3 …

because 1+2+3+2+1=9

9 is divisible by 3 9÷3=3

divisibility rule for2
Divisibility rule for

A number is divisible by 4, if the number formed by the last two digits is divisible by 4

For example:

824 is divisible by 4…

because 24 is divisible by 4

24÷4=6

divisibility rule for3
Divisibility rule for

A number is divisible by 5, if the number ends in a 0 or 5

For example:

120 and 325 are both divisible by 5 120 ends in 0 325 ends in 5

divisibility rule for4
Divisibility rule for

A number is divisible by 6, if the number is divisible by 2 and 3

For example:

36 is divisible by 2 since 6 is even

36 is divisible by 3 since 3+6=9

and 9 is divisible by 3

So, 36 is divisible by 6!

divisibility rule for5
Divisibility rule for

A number is divisible by 7, if you can take the last digit, double it and subtract it from the remaining number and the answer is divisible by 7

For example:

203 is divisible by 7…

because 3 doubled is 6, and 20-6=14

14 is divisible by 7 14÷7=2

divisibility rule for6
Divisibility rule for

A number is divisible by 8, if the last three digits are divisible by 8

For example:

1280 is divisible by 8…

because 280 is divisible by 8

280÷8=34 so, 1280÷8=160

divisibility rule for7
Divisibility rule for

A number is divisible by 9, if the sum of the digits is divisible by 9

For example:

7056 is divisible by 9…

because 7+0+5+6=18

and 18 is divisible by 9

18÷9=2

divisibility rule for8
Divisibility rule for

A number is divisible by 10, if the last digit is a zero

For example:

100, 240, 3750, 48,720 are all divisible by 10

let s review write these in your notes
Let’s review…Write these in your notes!
  • 2 if the ones digit is divisible by 2
  • 3 if the sum of the digits is divisible by 3
  • 4 if the # formed by the last two digits is divisible by 4
  • 5 if the last digit is a 0 or 5
  • 6 if the # is divisible by 2 and 3
  • 9 if the sum of the digits is divisible by 9
  • 10 if the last digit is a 0
thanks to
Thanks to …
  • www.artie.comARG! Cartoon AnimationA division of CityStar® Group, Inc.2 North Cascade Ave., Suite 1100Colorado Springs, CO 80903 USA719 471-9251