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Least common Denominator
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LCD means Least Common Denominator
You have to find the LCM (Least Common Multiple) of denominators of two fractions.
1/2  and  2/4  the LCM of 2 and 4 is 2 so their LCD is also 2.
3/7  and 5/6  the LCM of 7 and 6 is 42 so their LCD is also 42.

The LCM of the denominators is also the LCD of the two fractions.
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