# Chapter 5 - Section 5.2 - Negative Exponents and Scientiﬁc Notation - Practice: 18

$\frac{3}{64}$

#### Work Step by Step

1. Take the reciprocal of both fractions due to negative exponents which will give you $\frac{1}{4^2}-\frac{1}{4^3}$ 2. Find the least common denominator to add the fractions which will give you $\frac{4}{64}-\frac{1}{64}$ 3. Subtract the fractions which will give you $\frac{3}{64}$

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