1. The problem is to simplify the expression $\frac{90}{9}$.\n\n2. The formula for division is $\frac{a}{b} = c$ where $a$ is the numerator, $b$ is the denominator, and $c$ is the quotient.\n\n3. We divide 90 by 9. Both numbers are integers, so we can simplify directly.\n\n4. Write the division as a fraction: $$\frac{90}{9}$$\n\n5. Both numerator and denominator share a common factor of 9, so we can cancel it: $$\frac{\cancel{9} \times 10}{\cancel{9}} = 10$$\n\n6. Therefore, the simplified result is 10.\n\nFinal answer: 10