Rates & Unit Rates 6.N.3

5.3 Rates

How can you use rates to describe changes in real life problems?

Which is a better buy and why?

​$6.39

$12.99

Write this in your notebook.

Rate - a ratio of two quantities using different units

Unit rate - compares a quantity to one unit of another quantity. How much of something per 1 unit of something else

Equivalent rates - have the same unit rate

Examples

• 30 cars pass by in 2 hours. The unit rate is 15 cars per hour.

• You can paint 4 boards in half an hour. The unit rate is 8 boards per hour.

• There were 75 students and 3 teachers. The unit rate is 25 students per teacher.

• They need 5 m of thread to make 2 cm of cloth. The unit rate is 2.5 m per cm.

• You buy a 12-pace of Coke for $4.99. The unit rate is $0.42 per can.

Multiple Choice

If the unit price for bananas is $1.44 per pound, how much would it cost to buy 6 pounds of bananas?

• $0.24
• $2.40
• $8.64
• $7.56

Multiple Choice

Which is the better buy?

• A 4 pack of t-shirts for $2.24
• A 6-pack of t-shirts for $3.12
• An 8 pack of t-shirts for $4.24