how could you test if anumber is divisible by 12, 15 or 24
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If that number divisible by 2.3 then it divisible by 12
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.
What is the divisibility rule of 24? If the number is separately divisible by 3 and 8 then the number is divisible by 24. This would work because 3 and 8 are relatively prime to each other, meaning that they don't share any factor other than 1.
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