There are many different ways to compare amounts or quantities. A ratio is a comparison of two quantities by division. For example, the ratio of a to b can be written in two different ways.
a/b or a: bWe want to find the ratio of boys to girls in a class. To do so, we will write the fraction that represents desired ratio. We will write the number of boys in the numerator and the number of girls in the denominator.
l boys→ girls→
10/15
Finally, since the greatest common factor (GCF) of 10 and 15 is 5, we can reduce the fraction by dividing both the numerator and denominator by 5.
