Follow instructions on frame to enter numerator and denominator.
To find the GCD of the pair, follow instructions below the frame.
 
 

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  1.In the denominator position of the rightmost pair enter the number in the numerator position of the previous pair.
2.In the numerator position of the rightmost pair enter the difference between the two numbers of the previous pair.
3.Create a new pair and repeat steps 1 and 2 until the two numbers of the rightmost pair are equal.
*You have found the GCD of the original pair of numbers.