To write a fraction as a percent, first remember that a percent is a ratio of a number to 100. If we want to write \(\frac{9}{20}\) as a percent, we need to find a fraction equivalent to \(\frac{9}{20}\) that has a 100 in the denominator. We can do this by setting up a proportion.
\(\frac{9}{20}\) = \(\frac{n}{100}\)
Now, we can use cross products to find the missing value.
20n = 900
÷20 ÷20 ← divide by 20 on both sides
n = 45
Therefore, \(\frac{9}{20}\) is equal to \(\frac{45}{100}\) or 45%.
