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 divisibility rules. These are useful to solve problems quickly in Aptitude Tests. These rules are mainly useful to check if a number is Prime. Suppose you want to find 45647845631214566461 is divisible by 3 or not. You cannot perform division calculation because it takes a lot of time. This is where you need divisibility rules. This rules makes your division easy. Here, divisibility rules for different numbers with examples under each divisibility rule is explained and generalized rules for divisibility by any number is also included at the end.
1. What is Divisibility
2. Divisibility Rules For Numbers Up To 20
3. Generalized Divisibility Rules