1. The problem is to calculate the product of 9 and 9. 2. The formula for multiplication is $a \times b = c$, where $a$ and $b$ are numbers and $c$ is their product. 3. Here, $a = 9$ and $b = 9$. 4. Multiply the two numbers: $$9 \times 9 = 81$$ 5. Therefore, the answer is 81.