No, the denominators have to be the same.
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First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators
I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.
Because think of like fractions as the same things.. you can subtract halves from halves for example, but what does it mean to take away a half from a third?By converting them into like fractions, we can add or subtract them easily.
because it would be diffcult to understand.[you don't add or subtract the demonters]
To multiply two fractions, the numerator (top part) of the result is the product of the numerators, and the denominator (bottom part) of the result is the product of the denominators. There is no need to convert to a common denominator first; this is only necessary to add, subtract, or compare fractions. For example, 1/2 x 5/7 = (1x5) / (2x7) = 5/14. Note that it is easier to do any simplifications BEFORE doing the actual multiplication.