What is the GFC of the numbers 12,18 and 26

The greatest common factor (GCF) of 12, 18, and 26 is: 2

Since the lowest number is 12, you should only include factors up to 12.

Factors of 12: 1, 2, 3, 4, 6, 12

Factors of 18: 1, 2, 3, 6, 9

Factors of 26: 1, 2

The common factors between the three numbers are 1 and 2, but you are looking for the greatest common factor. The greatest means the highest, and which is the highest number out of 1 and 2? 2, so that is your answer.

The greatest number they can all go into is 2.