# Divisibility Tests

- Author:
- A B Cron

- Topic:
- Division

Divisibility test are tools to determine if a number can be divided by particular factor. While there are many numbers which are Prime (divisible by the number and 1 only), many more of the numbers we encounter are Composite (divisible by more than 2 numbers). By learning divisibility tests, a person can quickly determine whether (1) a number is composite or prime, (2) the numbers share factors (finding common denominators, LCD), (3) the GCF of a list of numbers, and many other short cuts in arithmetic.

Olsen, Allen.

*Delving Deeper: Divisibility Tests*.**Mathematics Teacher**. pp45-52. Vol. 100, No. 1, Aug. 2006. MathIsFun Math Goodies Video Math Playground