Useful Programs
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Calculatormatik is a math tool that includes many calculators and converters. 
Calculate/Convert everything with Calculatormatik.

Divisibility Calculator
Calculate divisible of numbers and learn Divisibility Rules.
nth Root Calculator
Calculate nth Root of any number easily.
Prime Factor Calculator
Calculate prime factors of any numbers.
Prime, Non-Prime Numbers
Calculate Prime and Non-Prime numbers.
Square (Root), Cube (Root) Calculator
Calculate Square and Square Root, Cube and Cube Root of any number easily.
MBA Stopwatch
Stopwatch with split-seconds, seconds, minutes and hours.