To find the LCD of 1/3 and 2/7:
Identify the denominators: 3 and 7.
Find the least common multiple (LCM) of the denominators:
Multiples of 7:
7, 14, 21, 28, 35, 42...
Multiples of 3:
3, 6, 9, 12, 15, 17, 21, 24, 27.
Therefore, the LCD of 1/2 and 2/7 is 21, which is the LCM of 3 and 7 (the denominators).
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