♥ Common factors of 9: <span>1, 3, 9 </span>♥ Common factors of 18 are: <span>1, 2, 3, 6, 9, 18 </span>The Greatest Common Factor: =9 You can find the greatest common factor by looking at the highest point in each factor. The highest in 9 is 9 and 9 is in 18 and that is the highest of 9 therefore its the highest total.
