27/5  32/10 =
54/10  32/10 = 22/10 = 11/5 ( you did not make the denominator common.)
Mistake in your 2nd method.
In your first example, when using / for fraction sign you should enclose numerator and denominator in parenthesis.
5*2/5  3*2/10=
2  3/5 = 10/5  3/5 = 7/5
This is the way you have written your problems.
Remember , only fractions with the same denominator can add. So by use of LCM you should make denominators alike, then add, by writing the common denominator and adding the numerator.
11/30/2013

Parviz F.
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