Ratio
A ratio is a comparison of 2 quantities
Ratio
Comparing same
type of measure
part to whole
(fraction)
Comparing
different types of
measure
part to part
Rate
Ratios can be expressed in three forms:
3 to 5
3:5
3
5
Equal ratios form a proportion
Rates and Better Buys
Rate is a very important type of ratio used in many everyday problems. Almost every activity
involves some type of rate. Number of heart beats per minute is called a “heart rate” . The little
word “per” is always a clue that you are dealing with a rate.
Unit price is a particular rate that compares a price to some unit of measure. For example,
suppose freezies are on sale for $1.50 per half dozen. The unit price is $1.50 divided by 6 or 25
cents per freeze.
The word “per” can be replaced by the “/” in problems, so 25 cents per freezie can also be
written 25 cents/freezie.