The Greatest Common Factor is the highest number that will exactly divide into two or more numbers.
A set of numbers whose GCF is one are called co-prime or relatively prime
The GCF of 6 and 10 is 2.
20 and 100.GCF is 20, and LCM is 100.
16,24
4 and 9 have a GCF of 1
The pair of numbers whose GCF is 1 and LCM is 36 is 9 and 4. The numbers should be greater than their GCF and less than their LCM.
12 and 66
10,20
240 and 300
30 and 60
21 and 42.
15 and 30