Topic 6: Understand and Use Ratio and Rate

Front

What is a ratio?

Back

A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a to b' or as a fraction a/b.

Front

How do you find the total number of items in a ratio?

Back

To find the total number of items in a ratio, add the parts of the ratio together. For example, in the ratio 4:6:5, the total is 4 + 6 + 5 = 15.

Front

What is the ratio of apples to total pieces of fruit if there are 5 apples in a basket of 15 fruits?

Back

Front

How do you calculate a rate?

Back

A rate is calculated by dividing the quantity of one item by the quantity of another item, often expressed as 'per unit'. For example, if a car travels 60 miles in 2 hours, the rate is 30 miles per hour.

Front

If Martin reads 3 books in 8 days, how many books can he read in 32 days?

Back

At the same rate, Martin can read 12 books in 32 days.

Front

What is the formula to find the unit rate?

Back

Front

How do you compare rates?

Back

To compare rates, convert them to the same unit and then compare the values. For example, if Brittany walks 5 miles in 60 minutes and Derrick walks 7 miles in 77 minutes, convert both to miles per minute.

Front

What is the unit rate of Brittany's walking speed if she walks 5 miles in 60 minutes?

Back

Front

How do you determine who has a faster rate between two people?

Back

To determine who has a faster rate, calculate the unit rate for both individuals and compare the results.

Front

If Bubbly Bakery sells a dozen doughnuts for $24.00, what is the cost of one doughnut?

Back

The cost of one doughnut is $2.