1. The problem is to find the square root of 100. 2. The square root of a number $x$ is a value $y$ such that $y^2 = x$. 3. Here, we want to find $y$ such that $y^2 = 100$. 4. Since $10^2 = 100$, the square root of 100 is 10. 5. Therefore, $\sqrt{100} = 10$.