Question

If a number is divisible by 3 and 5, then it is always divisible by 15

Answer 1

Answer:

Step-by-step explanation:

To be divisible by 15 a number has to be divisible by 3 and by 5. To be divisible by 5 the number must end in a 0 or a 5, easy enough. However divisibility by 3 is not so simple - the rule is to add up all of the digits of the number and if they are a multiple of 3 then the original number is also.