15/4 in simplest form
Understand the Problem
The question asks to simplify the fraction 15/4 to its simplest form. To do this, we can check if the numerator and denominator share any common factors, but since both are prime to each other, the fraction is already in simplest form as it is an improper fraction.
Answer
The fraction $\frac{15}{4}$ is in its simplest form.
Answer for screen readers
The fraction $\frac{15}{4}$ is in its simplest form.
Steps to Solve

Identify the Fraction The fraction given is $\frac{15}{4}$.

Check for Common Factors To determine if the fraction can be simplified, check for any common factors between the numerator (15) and the denominator (4).

Find Factors of the Numerator The factors of 15 are 1, 3, 5, and 15.

Find Factors of the Denominator The factors of 4 are 1, 2, and 4.

Identify Common Factors Compare the factors of 15 and 4. The only common factor is 1, indicating that there are no other common factors.

Conclusion Since the only common factor is 1, the fraction $\frac{15}{4}$ is already in its simplest form and cannot be reduced further.
The fraction $\frac{15}{4}$ is in its simplest form.
More Information
This fraction is an improper fraction because the numerator is greater than the denominator. It can also be expressed as a mixed number, which would be $3 \frac{3}{4}$.
Tips
 Mistaking the fraction as reducible when the numerator and denominator are relatively prime. Always check for common factors.