Hello.
To find the Greatest Common Factor of two numbers, you have to break it down by finding its prime factors, then multiply the greatest number both numbers have in common.
The Factors of 14 are: 14, 7, and 1.
The Factors of 55 are: 55, 11, and 1.
The greatest number both numbers have in common are 1.
1 x 1 = 1
Therefore, the Greatest Common Factor of 14 and 55 is 1.
