Teacher2Teacher 
Q&A #5103 
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From: Loyd <loydlin@aol.com> To: Teacher2Teacher Public Discussion Date: 2003072912:16:40 Subject: Re: Re: Math Teacher responds Taken from a previous post: <<<<<<<<<Your method: 60/100 + 17/20 + 8/10 = 85/130 = 65%>>>> the three terms are not averages. What you have is unlike fractions and you can not add like that. It is dead wrong. 100 is the Least common denominator so the fractions convert to: 60/100 85/100 80/100. Now you can add the numerators and divide by the common denominator. Divide by three and you will get the average. T "your method" method should never be used by anyone teaching mathematics. To call 60/100 an average is wrong. It is a score represented as a ratio of right to wrong.
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