Question

What is the fraction 36/80 expressed in lowest terms?

Answer 1

Look for common factors and divide them out of both numerator and denominator at the same time.
You know they're both divisible by 2, so you can simplify to 18/40.
As you can see, both numbers are still divisible by 2, so you can go down to 9/20.
At this point, they have no common factors, so the fraction is in lowest terms.

Answer 2

Reduce the expression by cancelling the common factors.
9/20

Exact Form:
9/20

Decimal Form:
0.45