5 = 5
12 = 2² x 3
15 = 3 x 5
2² x 3 x 5 = 60
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5 factors into 1 and 5 6 factors into 2 and 3 Therefore, the least common multiple is 1*2*3*5 = 30 This is what you would use for the LCD, convert the fifths and sixths into thirtieths.
15
LCD(49, 21) = 147
You need at least two fractions to find something in common.
2/3 and 3/4Looks like 12 here, so use form of one to convert both fractions to LCD form.4*2/4*3 and 3*3/3*48/12 and 9/12==========