To find the least common denominator (LCD) of the fractions \( \frac{3}{4} \) and \( \frac{5}{8} \), we first identify the denominators of the two fractions, which are 4 and 8.
Next, we find the least common multiple (LCM) of these denominators:
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Identify the multiples of 4 and 8:
- Multiples of 4: 4, 8, 12, 16, 20, ...
- Multiples of 8: 8, 16, 24, ...
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Find the smallest common multiple:
- The smallest common multiple between these two lists is 8.
Thus, the least common denominator of \( \frac{3}{4} \) and \( \frac{5}{8} \) is 8.