Answer:
Greatest common factor (GCF) of 48 and 52 is 4.
Explanation:
There are a number of different ways to calculate the GCF of a set of numbers depending how many numbers you have and how large they are.
For smaller numbers you can simply look at the factors or multiples for each number and find the greatest common multiple of them.
For 48, 52, and 72 those factors look like this:
Factors for 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48
Factors for 52: 1, 2, 4, 13, 26, and 52
Factors for 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72
As you can see when you list out the factors of each number, 4 is the greatest number that 48, 28, 52, and 72 divides into.