#### 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 topics 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