Answer:
7 divides into 51 exactly 3 times, so it is said that 51 is
divisible by 17. It also follows that 51 is divisible by 3.
The property of being divisible by a number is known as divisibility.
There are many tests for divisibility, such as:
 Any whole number ending in the digits 0 or 5
is always visible by 5
 Any whole number whose digit sum is divisible
by 3 or 9 is itself divisible by 3 or 9.
For example, the number 234 675 ends in 5 and its digit sum
is 2 + 3 + 4 + 6 + 7 + 5 = 27 which is divisible by 9, so
234 675 is divisible by 5 and by 9.
