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Divisibility Rules (3, 6 and 9)

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let's look at divisibility by the

numbers three six and nine first we look

at divisibility by three a number is

divisible by three if the sum of its

digits is divisible by three is twenty

five thousand seven hundred twenty two

divisible by three this number has five

digits let's add them two plus five plus

seven plus two plus two 2 plus 5 is 7 7

plus 7 is 14 and 14 plus four is 18 so

the sum of its digits is 18 is this sum

divisible by three yes 18 is divisible

by three hence this number is also

divisible by three if the sum is not

divisible by three then the number two

is not divisible by three let's zoom out

and understand another divisibility rule

divisibility by 6 is not the simplest

but it's definitely very interesting

there are just two simple conditions we

can say that a number is divisible by 6