how do I get the answer to this addition of fractions? 9/20 + 3/18

I know the answer is 37/60 but I have no idea how to get there. Am I right by using 180 as my least common denominator?
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1 Answer

3/18=1/6, so yu hav (9/20) +(1/6)

=(27/60) +(10/60)

=37/60

=0.61666666666666666...
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