Asked by Mae

Which number is NOT divisible by 9?
Answered by Ms. Sue
What are your choices?

What is your answer?
Answered by Mae
117
252
133
351

I don't have an answer I need help finding the answer.
Answered by Mae
Its 133.
Answered by Ms. Sue
Right.
Answered by Reiny
Here is a little trick that works with 9 and 3

add up the digits of your number.
If that sum is divisible by 9, then so is the original number.
The same rule applies to 3

e.g.
is 12546 divisible by 3 ?
add them up to get 18
since 18 divides evenly by 3, so does 12546

notice that since 18 also divides evenly by 9, so does 12546
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