cross multiplication

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DO Now Which is the better buy? 1. 5 lb for $37 or 8 lb for $43 Which car is going faster? 2. 340 miles over 5 hours or 536 miles over 7 hours.

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Page 1: Cross multiplication

DO NowWhich is the better buy?

1. 5 lb for $37 or 8 lb for $43

Which car is going faster?

2. 340 miles over 5 hours or 536 miles over 7 hours.

Page 2: Cross multiplication

1 About 1 of every 10 people is left handed. How many would you predict to be left handed in this math class?

Page 3: Cross multiplication

2 A clock chimes 4 times each hour. How many times does it chime in a week?

Page 4: Cross multiplication

3 You are paid $47.25 for 7 hours of work. How much are you paid per hour?

Page 5: Cross multiplication

4 The table shows the costs of oranges at four grocery stores. Which grocery store prices its oranges using a constant unit rate?

A Store A

B Store B

C Store C

D Store D

A B C D

10 LB BAG

$11.70

$11.70 $12.00 $12.00

20 LB BAG

$22.90

$23.40 $24.00 $22.00

30 LB BAG

$33.60

$35.10 $35.00 $32.00

Page 6: Cross multiplication

Cross Product Property

Words:The cross products of a proportion are equal

Ex:

=

Page 7: Cross multiplication
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