Solve: 57 Minus Circle Symbol (Where Circle = 8)

To solve this problem, we'll perform a direct replacement and subtraction. Here are the steps:

• Step 1: Replace $\circ$ with its given value. We know that $\circ = 8$, so we substitute to get $57 - 8$.
• Step 2: Perform the subtraction operation. We need to compute $57 - 8$.

Starting from the rightmost digit of the two numbers involved, we need to subtract 8 from 57:

• First, look at the units digit: Since 7 is greater than 8, let's subtract directly: $7 - 8$ cannot be done directly as we need to regroup.
• We regroup by borrowing 1 ten from the tens place in 57. This turns the 5 in the tens place into a 4, and the 7 in the units place into 17.
• Now subtract the single digits: $17 - 8 = 9$.
• Finally, subtract the tens digits: $4 - 0 = 4$.

As a result, $57 - 8 = 49$.

This solution corresponds to choice 1: $49$.

Therefore, the solution to the problem is $49$.