What are the highest common factors of 48 and 56?

The greatest common factor is the highest number that divides exactly into two or more numbers.

48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

56: 1, 2, 4, 7, 8, 14, 28, 56

The GCF for 48 and 56 is 8.