1. The problem is to simplify the expression $36\sqrt{36}$. 2. Recall that $\sqrt{36}$ means the square root of 36, which is the number that when multiplied by itself gives 36. 3. Since $6 \times 6 = 36$, we have $\sqrt{36} = 6$. 4. Substitute this back into the expression: $36 \times 6$. 5. Multiply: $36 \times 6 = 216$. 6. Therefore, the simplified value of $36\sqrt{36}$ is $216$.