Introduction
Divisibility rules involve finding out without actually dividing whether a given whole number is a factor of another whole number. Many textbooks that have this topic states the following rules:
Any whole number is exactly divisible by:
– 2 if its last digit is even
– 3 if the sum if its digits form a number divisible by 3
– 4 if the last two digits form a number divisible by 4
– 5 if the last digit is 5 or 0
– 6 If its last digit is even and the sum of its digits form a number divisible by 3
– 8 if the last three digits form a number divisible by 8
– 9 if the sum of the digits is divisible by 9
– 10 if the last digit is 0
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