Unit Rates and Better Buy

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities where one of the quantities is expressed as one unit. For example, if a car travels 300 miles in 5 hours, the unit rate is 60 miles per hour.

Front

How do you calculate the unit price?

Back

To calculate the unit price, divide the total price by the number of units. For example, if a 12-pack of soda costs $6, the unit price is $6 ÷ 12 = $0.50 per can.

Front

What does 'better buy' mean?

Back

'Better buy' refers to the option that offers more value for the price, often determined by comparing unit prices.

Front

How do you compare two unit rates?

Back

To compare two unit rates, calculate the unit rate for each option and then compare the values. The lower unit rate indicates a better deal.

Front

If 4 kg of apples cost $8, what is the cost per kg?

Back

The cost per kg is $8 ÷ 4 kg = $2 per kg.

Front

Which is a better buy: 3 lbs of grapes for $4.50 or 5 lbs for $7.50?

Back

Calculate the unit price: 3 lbs = $4.50, so $4.50 ÷ 3 = $1.50 per lb; 5 lbs = $7.50, so $7.50 ÷ 5 = $1.50 per lb. They are the same price per lb.

Front

How do you find the price of one item from a bulk purchase?

Back

Divide the total price by the number of items in the bulk purchase. For example, if 10 notebooks cost $20, the price per notebook is $20 ÷ 10 = $2.

Front

What is the formula for calculating gas mileage?

Back

Gas mileage is calculated by dividing the number of miles driven by the number of gallons of gas used. For example, if a car drives 300 miles on 10 gallons, the mileage is 300 ÷ 10 = 30 miles per gallon.

Front

If a 6-pack of water costs $3.00, what is the cost per bottle?

Back

The cost per bottle is $3.00 ÷ 6 = $0.50 per bottle.

Front

What is the better buy: 10 pencils for $2 or 15 pencils for $3?

Back

Calculate the unit price: 10 pencils = $2, so $2 ÷ 10 = $0.20 per pencil; 15 pencils = $3, so $3 ÷ 15 = $0.20 per pencil. They are the same price per pencil.