When it is a factor of that particular number.
If the sum of the digits is a multiple of three, the whole number is a multiple of three.
Yes because the five has gas
You know that it is a multiple of 9 if it divides into 9 equally.
Any multiple of 5 will do.
5,10,15,20,25,30
15
yes because if it has a zero or five at the end you know its a multiple of 5
When a number is a multiple of 5, the possible values of the ones digit are zero and five.
That's not a number, fifteen is a multiple of five if that's what you mean.
Try 30
When it is a factor of that particular number.
The probability will depend on how much you know and the extent of guessing.
Divide the smaller number into the larger one. If the answer is an integer, it's a multiple.
If the sum of the digits is a multiple of three, the whole number is a multiple of three.
Yes. Any number that ends with 0 or 5 is a multiple of 5. (5x16=80)
Yes because the five has gas