What is the Greatest Common Factor of 42, 126, and 210?

Solution: 

Given: 42, 126, 210

GCF is the greatest common factor or highest integer that divides all the numbers.

Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42.

Factors of 126: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126.

Factors of 210: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, and 210.

As you can see from the above, 42 is the highest integer that divides all the three numbers 42, 126, 210.

Thus, the greatest common factor of 42, 126, 210 is 42.

What is the Greatest Common Factor of 42, 126, and 210?

Summary:

The Greatest Common Factor of 42, 126, and 210 is 42.