Calculate the Difference: √400 - √225 Step by Step

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

• Step 1: Find $\sqrt{400}$.
• Step 2: Find $\sqrt{225}$.
• Step 3: Subtract $\sqrt{225}$ from $\sqrt{400}$.

Now, let's work through each step:
Step 1: Calculate $\sqrt{400}$. Since $400 = 20^2$, it follows that $\sqrt{400} = 20$.

Step 2: Calculate $\sqrt{225}$. Since $225 = 15^2$, it follows that $\sqrt{225} = 15$.

Step 3: Subtract $\sqrt{225}$ from $\sqrt{400}$:

$20 - 15 = 5$.

Therefore, the solution to the problem is $\boxed{5}$.