That depends. If it is a fraction, can you cancel out some numbers? If it is an expression, can you combine like terms? Or do you need to factor?
Answer: 24.84
Step-by-step explanation: 276%of 9 is 24.84
(5 cups)/(2.5 days) = (2 cups)/(1 day)
<u><em>
. . . answer is 2 cups</em></u>

When 0 is in the numerator, then the whole fraction becomes equal to 0.
However if 0 is in the denominator, then it is undefined.
The decimal form for nine and fifteen thousandths is 09.15