Ratios

A ratio is a relationship between two numbers indicating how many times the first number contains the second.

To calculate a unit rate, divide the quantity of one item by the quantity of another item, typically expressed per one unit of the second item.

The speed is 60 miles per hour, calculated by dividing 240 miles by 4 hours.

Multiply the rate of output by the total time or quantity to find the total output.

Cost per item = Total cost / Number of items.

You earn $5 per car, calculated by dividing $35 by 7 cars.

The relationship is linear; as the number of cars washed increases, the earnings increase proportionally.

Divide the total price by the number of items purchased.

The ratio is 3:1.

A ratio can be expressed as a fraction by placing the first quantity over the second quantity.