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Teachers' Lounge Discussion: Grading policy

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From: Loyd

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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