Solve 507 minus 69: Vertical Subtraction Problem

To solve this problem, we'll follow these steps:

• Step 1: Align the two numbers for vertical subtraction
• Step 2: Subtract digit by digit, starting from the right
• Step 3: Borrow when necessary, particularly across zeros

Now, let's work through each step:
Step 1: Write the numbers vertically, aligning by place values:
$\begin{array}{c} 507 \\ - 69 \\ \hline \end{array}$

Step 2: Start subtracting from the units (right-most) digit:
Units column: 7 (from 507) minus 9 (from 69). Since 7 is smaller than 9, borrow 1 from the tens column.

Step 3: Borrowing across zeros:
Borrowing from the tens column requires rolling up to the hundreds column because there is a 0 in the tens place. Change 5 in the hundreds place to 4, making the tens place 10. Now the tens column has 9 after lending 1 to the units column, making it 17.
Subtract 9 from 17 in the units place to get 8.

Step 4: Subtract the tens column:
9 (from borrowing adjustment) minus 6 (from 69) is 3.

Step 5: Subtract the hundreds column:
4 (from borrowing adjustment) minus 0 (from 69) is 4.

Therefore, the subtraction result is:
$\begin{array}{c} 438 \\ \end{array}$

Thus, the solution to the problem is $438$.