How do you find whether a number is exactly divisible by another number? By performing division calculation? No, you cannot do that for every number. That’s why we need to follow

**math division rules**. These are useful to solve divisibility questions. These rules are also useful to check if a number is Prime. Suppose you want to find 45647845631214566461 is come under*numbers divisible by 3*or not. You cannot perform division calculation because it takes lot of time. This is where you need divisibility rules. These rules make your division easy. Here, divisible rules for different numbers with examples under each divisibility rule is explained and generalized rules for division by any number is also included at the end.**Contents**

**1. What does divisibility mean**

**2. Divisibility rules for numbers 1 – 20**

**3. Generalized rules for division**

## What does divisibility mean

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**Divisible by**” means when you divide one number with another number the result should be whole number with zero remainder.Ex :

6/3 = 2 ; 6 is divisible by 3, because result 2 is whole number and remainder is 0.

7/3 = 2.33 ; 7 is not divisible by 3, because result 2.33 is not whole number and remainder is 1.