Highest common factor between 9 and 15 July 8, 2019 16 32 64 128 Highest common factor 9 and 15 What is the highest common factor (gcf) of 9 and 15 Highest common factor of 6 9 and 15 Highest common factor of 9 15 and 24 Highest common factor of 9 15 and 30 Highest common factor of 9 15 and 21 Highest common factor of 3 9 and 15 1 2 3 4 5 moddalar