LCM = 56
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Common denominators of 8 and 15 are 120 and all its multiples.
24 and 48 are two possible common denominators for 3/8 and 5/6.
16 is the answer you're looking for. If you have two fractions with denominators of 8 & 16, then 16 is the Least Common Multiple of the two denominators.
LCD(100, 8) = 200
you subtract the top 2 numbers and then leave the denominators the same like: 7/8-4/8=3/8. Get it?