Let's say that you were multiplying 10 by 2/5 ,
you would turn the 10 into 10/1 which is still equal to 10
then you multiply 10/1 and 2/5 by multiplying the numerators (the top numbers) and the denominators (the bottom numbers)
10*2/1*5 = 20/5 = 4
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Fractions and integers can be equivalent, but they are different things. An integer can be written as a fraction (7 = 7/1 or 21/3) but in its simplified form it is not a fraction.
This has the effect of producing a denominator in the answer that has each of the original denominators as factors. You don't have to worry about simplifying the fractions before multiplying. Of course, you may have to simplify after multiplying. There's no way out.
it works when comparing fractions by multiplying the fractions to see whitch one is greater not greater and equal
You basically have to learn separately how to do different things with fractions, including finding a common denominator; converting fractions to a different denominator; simplifying fractions; adding and subtracting fractions; multiplying fractions; dividing fractions.
They are called integers. Fractions and decimals are NOT integers, even if it has a positive or negative sign.