## Divisibility Rules: How to test if a number is divisible by 2,3,4,5,6,8,9

or 10. Divisibility Calculator
--------------------
',n="","ript>

Source: www.mathwarehouse.com/arithmetic/numbers/divisibility-rules-and-tests.php

## Divisibility rule - Wikipedia, the free encyclopedia

--------------------

** Divisibility rule **

these issues on the *talk page*. /(Learn how and when to remove these
template messages)/

overview of all important aspects of the article. Please discuss this issue
on the article's talk page. /(May 2013)/

or instruction. /(May 2013)/ /(Learn how and when to remove this template
message)/

/(Learn how and when to remove this template message)/

A *divisibility rule* is a shorthand way of determining whether a given
number is divisible by a fixed divisor without performing the division,
usually by examining its digits. Although there are divisibility tests for
presents rules and examples only for decimal, or base 10, numbers.

*Contents*

· 1 Divisibility rules for numbers 1â30
· 2 Step-by-step examples

· 2.1 Divisibility by 2
· 2.2 Divisibility by 3 or 9
· 2.3 Divisibility by 4
· 2.4 Divisibility by 5
· 2.5 Divisibility by 6
· 2.6 Divisibility by 7
· 2.7 Divisibility by 13

· 3 Beyond 30

· 3.1 Composite divisors
· 3.2 Prime divisors
· 3.3 Notable examples

· 4 Generalized divisibility rule
· 5 Proofs

· 5.1 Proof using basic algebra
· 5.2 Proof using modular arithmetic

· 6 Notes
· 7

Source: en.wikipedia.org/wiki/Divisibility_rule