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To find prime number common divisors of the numerator and denominator
of a fraction. Press the arrow keys to find a prime divisor of
the numerator. To select the prime divisor, click on the numbers across the
vertical line directly to the right of the numerator. To see if the
number is a divisor of the denominator, press arrow key to enter the number below the
denominator and to select click on the numbers across the
vertical line directly to the right of the denominator. Each time you
find a common divisor continue entering primes in order from left to
right. When you can find no more common primes, multiply the found common
divisors to get the Greatest Common Divisor (GCD).
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