Answer:
3/4
Explanation:
I do it by steps.
first, they are both even 10s, so just drop the zeros.
9/12
then, find the largest number that both are divisible by-
neither is divisible by 5. 12 is divisible by 4, but 9 is not.
both can be divided by 3.
9÷3=3
12÷3=4
so, 3/4