g_Math

A number is divisible by three if

Its digits add up to a multiple of 3

A number is divisible by 4 if

Its last two digits are divisible by 4

A number is divisible by 5

If last digit is a 5 or 0

A number is divisible by 6

Apply the rules of 2 and 3

A number is divisible by 9 if

Its digits add up to a multiple of 9 (235,692 ; 2+3+5+6+9+2 = 27)

A number is divisible by 12 if

Apply the rules of 3 and 4