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Question
Hello:

I read the following in a business mathematics book: "Multiply the number by 1, expressed as 100/100, to change the number to a fraction with the denominator 100."  

Why would the author want to indicate multiplying by 1 expressed as 100/100 to change a number into a percentage?  Multiplying by 1 will not change the value of the number.  Why is this important to know when changing a number to a percentage?

I thank you for your reply.

Answer
Percent "%" means as a fraction "out of 100" So 87% is 87/100. So if you want to know what percent say .63 is then you need to write it as something over 100. The simplest way to do this is multiply it by 100/100 which obviously doesn't change anything since 100/100 =1. So .63*100/100=63/100 so this tells you .63 is 63%.  

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