# How do you find the GCF of 66, 90, and 150?

Jan 12, 2017

$6$

#### Explanation:

Note that the prime factorisation of $66$ is:

$66 = 2 \cdot 3 \cdot 11$

Both $90$ and $150$ are divisible by $2$ and by $3$, but not by $11$.

Hence all three numbers are divisible by $2 \cdot 3 = 6$ and nothing larger.