The sum of the digits of the number will add to a number that's divisible by nine. For example, 99 -> 9+9 -> 18. 18 is divisible by nine, thus 99 is. Any whole number that's divisible by nine will have its digits add up like this, and any whole number whose digits add up like this will be divisible by nine.
4 is not a factor of 9. The factors of 9 are 1, 3, and 9. The closest factor of 4 is 8.
D is the choice that is not true.
Yes.
Multiples of 9 have 9 as a factor.
Because 3 is a factor of 9.
No, 3 is a factor of 9.
9 is the greatest factor of 9.
That is true.
It can be. 9 is a factor of 18.
No, 9 is a factor of 357084
9 is a factor of 1620.
No, 9 is not a factor of 50.