It is 1 but the highest common factor is 2
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17 is the greatest common factor - it goes into 17 once, and 51 three times.
4 is the greatest common factor: it goes into 20 5 times and 24 6 times.
GCF stands for Greatest Common Factor. A factor is a number that goes into another number a whole number of times, and for the GCF to be larger that the least of the numbers, it would go into one number a fraction of a time.
The highest common factor of both number is 28
20 is a common factor of 80 and 100.