Find the Inverse Number: Converting 0.7 to Its Reciprocal

To determine the opposite number of $0.7$, we will simply change its sign, following these steps:

• Step 1: Identify the given number, which is $0.7$.
• Step 2: Change the sign of $0.7$ to find its opposite. Since $0.7$ is positive, its opposite will be negative.

By changing the sign of $0.7$, we get $-0.7$. Therefore, the opposite number of $0.7$ is $-0.7$.

In conclusion, the solution to the problem is $-0.7$.