Greatest Common Factor of 3 Numbers

The video tutorial introduces the concept of the greatest common factor (GCF) and demonstrates how to find it for the numbers 42, 126, and 210. The instructor explains the meaning of GCF, breaks down the process of finding factors, and uses a step-by-step approach to determine the GCF. The tutorial emphasizes starting with the smallest number to save time and verifies the solution by checking divisibility.

Why is it suggested to start with the smallest number when finding the GCF?

Describe the process of finding all factors of 42.

What is the significance of checking if a number divides evenly into another?