The Four Sevens

 

Solution

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The way to write four 7's with simple arithmetical signs in order to produce 100 is shown above. The fraction, 7 over decimal 7, equals 7 divided by 7/10, which in turn is the same as 70 divided by 7, or 10. Then 10 multiplied by 10 is 100. Such an equation's scheme can be applied to any number.

 
Posted: May 24, 2008
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