You need at least two numbers to find a GCF.
HCF is the highest common factor of two or more numbers. As you have provided with only one number hence we will take that the other number is 1. So HCF of 100 and 1 will be 1.
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The GCF is 25.
The GCF is 100.
5
20
It is 4
20
Factors of 1001,1002,504,255,2010
It is 20
2 is the hcf of 74 and 100
The HCF of 19 and 100 is 1
The GCF is 10.
5050 is the hcf