If you are trying to convert 1/2 and 2/5 to fractions with different denominators, multiply the fractions by a fraction that is equal to 1. Go to the following URL to see an example.
http://i30.tinypic.com30sbjfo.png
In this example we see that by multiplying 1/2 by 4/4 (which is equal to 1), we change the fraction's denominator (and numerator) and thus change the numbers without changing the value of the fraction.
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equivalent fractions of 1 over 6 = 2/12, 3/18, 4/24,...
1/3, 3/9, 4/12
similar fractions mean equivalent fractions. example is that if 4 is the numerator and 16 is the denominator 4 goes into 4 one time and 16 goes into four, 4 times so the answer is 1 over 4,and that's similar.
Similar fractions are fractions with the same denominator. 1/5, 2/5,/3/5
If you express the whole number w, as w/1, then there is no difference whatsoever.