Evaluate the Expression: Solving 66-9 Step by Step

To solve the problem, we need to find an equivalent expression for $66 - 9$.

• We start with the original expression $66 - 9$ and consider simplifying it.
• Notice that the number 9 can be broken into two smaller numbers: 6 and 3, such that $6 + 3 = 9$.
• This means we can rewrite the expression $66 - 9$ as $66 - 6 - 3$.

Now, let's verify:

Perform $66 - 6 = 60$.
Then perform $60 - 3 = 57$.

Therefore, the expression $66 - 6 - 3$ simplifies to 57, which is the same as the result of $66 - 9$.

Hence, the expression $66 - 6 - 3$ is equivalent to $66 - 9$.

Therefore, the correct choice is $66 - 6 - 3$.

Thus, the solution to the problem is $66 - 6 - 3$.