Question 108547
Let's divide and divide...

{{{45/75=(45/5)/(75/5)=9/15}}}
{{{9/15=(9/3)/(15/3)=3/5}}}


Since we divided by 5 and 3, the GCF of 45 and 75 is {{{3*5=15}}}


Power up,
HyperBrain!