The Highest Common Factor of two or more numbers is greater than
their Lowest Common Multiple.
If the sum of the digits of a number is divisible by 3, then the number
itself is divisible by 9.
A number with 4 or more digits is divisible by 8, if the number
formed by the last three digits is divisible by 8.
A number with three or more digits is divisible by 6, if the number
formed by its last two digits (i.e., ones and tens) is divisible by 6
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