Solve the Addition Problem: 12 + 58

To solve the addition problem $12 + 58$, we will use a step-by-step column addition method:

• Step 1: Align the numbers vertically by their place value, ensuring that the ones place is directly over each other.
• Step 2: Add the digits in the ones place: $2$ (from $12$) + $8$ (from $58$) = $10$.
• Step 3: Since the result is $10$ (which is greater than $9$), regroup by writing down the $0$ in the ones place and carrying over the $1$ to the tens place.
• Step 4: Move to the tens place. Add the digits: $1$ (carrying over from the ones place) + $1$ (from $12$) + $5$ (from $58$) = $7$.

Therefore, the sum of the numbers is $70$.

The correct answer choice is:

$70$