8 -6 6 th grade math Unit Price

8 -6 6 th grade math Unit Price

Objective • To find unit prices to determine the better buy. • Why? To know if you are spending your money wisely.

California State Standards AF 2. 3: Solve problems involving rates … NS 1. 2 : Interpret and use ratios in different contexts … to show the relative sizes of two quantities, using appropriate notations (x/y, x to y, x : y) NS 1. 3 : Use proportions to solve problems … AF 2. 2 : Demonstrate an understanding that rate is a measure of one quantity per unit value of another quantity.

Vocabulary • Unit price – The price for one unit • 5 candy bars for $1

How to Solve for Unit Price 1) Set up a proportion using the total price over the total units = price over 1 unit. $ unit is always the numerator. 2) Cross multiply 3) Check answer for reasonableness. The answer with the ‘cheaper’ or less price is the better buy. Which is the better buy: 12 for $60 or 15 for $79. 95? 60/12 = $5/1 79. 95/15 = $5. 33/1 12 for $60 is the better buy by 0. 33 per unit (less)

Try It! Find the unit price, round to nearest cent. 1) $87. 50 for 10 2) $46. 20 for 6 1) $87. 50 for 10 = $8. 75 for 1 2) $46. 20 for 6 = $7. 70 for 1

Try Some More! Find each unit price and the better buy. 3) 12 for $1. 80 or 15 for $2 4) 3 for $3. 50 or 4 for $5 3) 12 for $1. 80 or 15 for $2 = 1. 8/12 = 2/15 $ 0. 13 better buy 4) 3 for $3. 50 or 4 for $5 = 3. 5/3 = 5/4 $1. 17/1 $1. 25 better buy

Objective Review • To find unit prices to determine the better buy. • Why? You now know if you are spending your money wisely. • You now know that you can use proportions to find the unit rate. • Unit prices help you select the better buy.

Independent Practice • Complete problems 513 • Copy original problem first. • Show all work! • If time, complete Mixed Review: 14 -22 • If still more time, work on Accelerated Math.