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Bill Allen
 Post subject: Arithmetic Question 22
PostPosted: Mon Jan 17, 2011 11:05 am 
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Joined: Sun Nov 14, 2010 11:04 am
Posts: 10
The solution in the back of the book multiplied the answer by 4/4. Was then done to calculate the % easier. Please explain why this was done and should we take note of this for future problems?
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VP_Help
 Post subject: Re: Arithmetic Question 22
PostPosted: Mon Jan 17, 2011 3:57 pm 
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Joined: Thu Feb 12, 2009 6:32 pm
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They started with 9/25 and multiplied by 4/4 to get to a percentage, or a fraction over 100.
Since we must multiply 25 by 4 to get to 100, we can multiply both top and bottom by 4 to get to a fraction over 100 without changing the value.

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