Teacher2Teacher |
Q&A #18923 |
From: Ralph
(for Teacher2Teacher Service)
Date: Sep 25, 2007 at 08:51:03
Subject: Re: Subtracting fractions
Hi Paula, Thanks for writing to T2T. You don't mention what grade you're teaching, but the following suggestion would hopefully work for you. Using the "take away" interpretation of subtraction, you can observe that (using your example), we want to "take away" 3/5, but don't have any "fifths" to take away. If we took 1 of the "wholes", and cut it into fifths, we would then have 1 whole and five fifths. Now take away 3 of the fifths, and what we'd have left is 1 whole, and two fifths, So, 2 - 3/5 = 1 5/5 and 1 5/5 - 3/5 = 1 2/5 Hope this helps, -Ralph, for the T2T service
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