Find the Number of Outstanding Students: Solving the Pen Distribution Problem

To solve this problem, we'll follow these steps:

• Step 1: Identify the given information - There are 10 pens in total.
• Step 2: Understand the distribution - All pens are given out.
• Step 3: Conclude - The number of students is equal to the number of pens.

Let's work through these steps:

Step 1: The problem states clearly that the headteacher bought a total of $10$ pens.

Step 2: As the headteacher gives out all the pens, each student receives exactly one pen.

Step 3: Since there are $10$ pens and each student gets one pen, it follows that there must be exactly $10$ students.

Therefore, the solution to the problem is that there are $10$ outstanding students.