You add two fractions with a different denominator by multiplying the denominators by a number that will make them equal. Be sure to multiply the numerator by that number too.
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The first step, to add, subtract, or compare fractions, is always to convert the fractions to equivalent fractions, that all have the same denominator. You can use one of several techniques to get the LEAST common denominator, or simply multiply the two denominators to get a common denominator (which in this case may, or may not, be the smallest common denominator).
numerators you add, denominators you leave it the same
Because that is not how addition of fractions is defined.
convert both to numbers with lowest common denominator then add
First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators