Divisibility Rules

Ways to Check for DivisibilityDivisibility Rules

2Sound=20centuryDividing by 2All even numbers are divisible by 2Even numbers are numbers that end with either 2, 4, 6, 8, or 0

3groovyNow You TryAre these numbers divisible by 2?45812797595551050Dividing by 3Add up the digits of the numberIf that number is divisible by 3, then the original number isIf your sum is still a big number, continue to add the digits

5Nice Dividing by 3378For example, take the numberIf that number is divisible by 3, then the original number is

If your sum is still a big number, continue to add the digits

Add up the digits of the number

7+3+8=18Is 18 divisible by 3?1 + 8 = 9Is 9 divisible by 3?6Oh yeah!Now You TryAre these numbers divisible by 3?6395686360468

Dividing by 4If the last 2 digits together are divisible by 4(and the number is even)

8Great scottNow You TryAre these numbers divisible by 4?58426156920767Dividing by 5If the number ends in 5 or 0

10Great balls of fireNow You TryAre these numbers divisible by 5?5546890345902845Dividing by 6If the number is divisible by 2 and 3

12niceNow You TryAre these numbers divisible by 6?89725863034584Dividing by 7No ruleNow You TryAre these numbers divisible by 7?578398481903490Dividing by 8If the last three digits are divisible by 8 (and the number is even).If the number is divisible by 2, then by 2 again, and then by 2 againSo what type of number does it have to be?

16Sound=impressiveNow You TryAre these numbers divisible by 8?568396481903490Dividing by 9Similar to dividing by 3Add up digitsIf that number is divisible by 9 then your number is divisible by 9Dividing by 9If that number is divisible by 3, then the original number is

If your sum is still a big number, continue to add the digits

Add up the digits of the number

27Is 27 divisible by 9?2 + 7 = 9Is 9 divisible by 9?For example, take the number 924,5619+2+4+6+5+1=19Oh yeah!Now You TryAre these numbers divisible by 9?578398481903490Dividing by 10If the number ends with a 0

21All 2 easyNow You TryAre these numbers divisible by 10?578398481903490REVIEWDivisible by 2Divisible by 3Divisible by 4Divisible by 5Divisible by 6

Divisible by 7Divisible by 8Divisible by 9Divisible by 10

23Is this the endThat's all Folks!

24Thats all folksAssignment: Divisibility Worksheet