# Word Problems/Percentages

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 know how to change a number to a percentage; so do not explain to me how this process is done!

This is a little confusing.  A percent is the amount out of 100.
In other words, if you have 1 bad and 3 good, that is 1 bad out of 4.
In decimals, that is 0.25.  As a percent, it is 25%.

If there are 3 bad parts in 10 parts, that is 3/10 = 0.3.  To convert to a percent, always make sure there are at least two digits in the number past the decimal.  Since 0.3 only has 1 digit past the decimal, we'll make it be 0.30.  To convert to a percent, just shift the decimal by two places.  Thus, 0.30 = 30%.

Using this, it can be seen that 0.01 = 1%, 0.13 = 13%, 0.456 = 45.6%, 1.2345 = 123.45%,
1/4 = 0.25 = 25%, 2/5 = 0.4 =0.40 = 40%, etc.

Word Problems

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#### Scott A Wilson

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