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March 29, 2015

March 29, 2015

Posted by **6th Grade Math** on Friday, January 22, 2010 at 7:02pm.

How do I know what number goes on top and what number goes on the bottom. For example

3 pounds for $1.89

- Math -
**bobpursley**, Friday, January 22, 2010 at 7:11pmYOu can do it each way:

Both are unit rates, one is lbs/dollar, the other is dollars/lb

rate1= 1.89/3= 93 cents/lb or

rate2= 3/1.89= 1lb/1.57

You use the one depending on the type of problem..

What is the cost of 34 lbs?

cost= rate*lbs= .93dollars/lb *34 lbs

or

What is the amount I can get for 53 dollars

amount= rate*dollars

amount= 1lb/1.58dollars * 53 dollars

=33.5 lbs

So which rate? Examine both, and examine what you are looking for.

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