Divisibility Rules for numbers 2 to 10

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