The least common denominator (LCD) of the fractions 1/3 and 3/4, which is a common multiple of their denominators is: 12.
Recall:
Given two fractions, 1/3 and 3/4:
Their denominators are 3 and 4.
The common multiple between 3 and 4 is 12.
Therefore, the least common denominator (LCD) of the fractions 1/3 and 3/4, which is a common multiple of their denominators is: 12.
Learn more here:
check the picture below.
you'd use the corresponding sides in each figure.