The problem states that a school principal ordered $s$ new electric pencil sharpeners. Each classroom received 2 of them. We need to write an expression that shows the number of classrooms.

1. Problem Description

The problem states that a school principal ordered $s$ new electric pencil sharpeners. Each classroom received 2 of them. We need to write an expression that shows the number of classrooms.

2. Solution Steps

Let $s$ be the total number of pencil sharpeners.

Each classroom received 2 pencil sharpeners.

To find the number of classrooms, we divide the total number of pencil sharpeners by the number of pencil sharpeners each classroom received.

Number of classrooms = $\frac{\text{Total number of pencil sharpeners}}{\text{Number of pencil sharpeners per classroom}}$

Number of classrooms = $\frac{s}{2}$

3. Final Answer

$s/2$