Place Value Practice: Converting Units and Tens to Make Number 3

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

• Step 1: Determine the number of tens needed.
• Step 2: Determine the number of units needed.
• Step 3: Confirm the correct choice among given options.

Now, let's work through each step:
Step 1: Since the number we want to represent is 3, and 3 is less than 10, we do not need any tens to form the number.
Step 2: We need to represent the number 3 with units. Each unit represents a value of 1. Therefore, we require 3 units since $3 = 1 + 1 + 1$.
Step 3: Among the answer choices, the correct choice is the one that indicates using only units to make up the number 3. This matches choice 4: "Three units".

Therefore, the solution to the problem is three units.