Question
Which number is NOT divisible by 9?
Answers
Ms. Sue
What are your choices?
What is your answer?
What is your answer?
Mae
117
252
133
351
I don't have an answer I need help finding the answer.
252
133
351
I don't have an answer I need help finding the answer.
Mae
Its 133.
Ms. Sue
Right.
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
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