All of the composite numbers less than 100 have factor pairs.
When they have a factor in common greater than one.
2 and 7 are prime numbers less than 10 that are factors of 42 and 70.
When they have a common prime factor. When their GCF is greater than 1.
Smaller. Just try it out with some numbers; for example, 0.5 x 20 = 10 (10 is less than 20).
The least common factor of any set of numbers is 1.By definition, 1 is a factor of all numbers. And you cannot have a factor that is less than one so it is the least.In this case 1, is also the greatest common factor since the numbers have no other common factors. We call these numbers relatively prime.
54 and 63