Question

is 371640 divisible by 15 . give reasons

Answer 1

There is no one single rule for divisibility by 15, but every number that is divisible by 15 must be divisible by the factors of 15, namely 3 and 5. If your son knows these divisibility rules, then for divisibility by 15, he just includes both conditions.

If you are not sure of these 2 divisibilty rules, they are:

for divisibility by 3, add the digits of the number and if this sum is divisible by 3 then the number is divisible by 3

for divisibility by 5, the number must end in a 5 or a 0.

hope it's helpful
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