unit cost lesson. how much do you know about prices at the grocery store? (20 min) price is right...

Unit Cost lesson

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Extra Time? http://www.mathsisfun.com/measure/unit-price-game.html

We are going to calculate Unit Price Determine which item is a better value

Rice Chex CerealLarge = $1.99 (64 oz)Small = $2.49 (16 oz)

PopcornOrganic OR butter popcorn $2.99(3 bags)Smart Balance $2.99 (4 bags)

Ranch DressingKraft Ranch = $2.99 (16 oz)Hidden Valley Ranch = $3.69 (16 oz)

Fractions/Decimal Equivalents¾ = .75½ = .50

Need Number Line

0 1/4 3/41/2 1

0.25 0.5 0.75

Unit Price is the cost for each unit. Examples:

Per ounce Per lb Per item such as a bunch of bananas or bag of

candy bars

Formula:Price Per Unit = Price of item divided by # of units

Find the unit price of a 32 oz bottle of household cleaner and then decide which is the best purchase based on the unit price per ounce.

Size Price Unit Price

8 oz $1.99 24.875 ¢/oz

12 oz $2.99 24.917 ¢/oz

16 oz $3.49 21.813 ¢/oz

32 oz $6.29

The unit price for the 32-oz size is given by$6.29

32 oz

629 cents

32 oz

629 cents

32 oz 19.656 cents per ounce

19.656 ¢/oz

Based on unit price alone the 32-oz size is the best buy.

Place value

1.125678 1.124987

Compare Decimals

1.125678

1.124987

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