The greatest common factor (GCF) of two numbers is the largest number that divides both of them without leaving a remainder. To find the GCF of 49 and 20, we can start by determining the factors of each number.
For 49, the factors are: 1, 7, 49.
For 20, the factors are: 1, 2, 4, 5, 10, 20.
Now, let’s look for the common factors between the two sets. The only factor that appears in both lists is 1. Hence, the GCF of 49 and 20 is 1.
This means that 49 and 20 do not have any other common factors besides 1, making them relatively prime, or co-prime, to each other.