12. (3 points) A rectangular photo frame is 40 cm long and 32 cm wide. A photo that is 32 cm long and 28 cm wide is placed inside. The area of the part of the frame not covered by the photo is $\qquad$ square centimeters.
12. (3 points) A rectangular photo frame is 40 cm long and 32 cm wide. A photo that is 32 cm long and 28 cm wide is placed inside. The area of the part of the frame not covered by the photo is 384 square centimeters.
【Analysis】Placing a photo that is 32 cm long and 28 cm wide, the area covered by the photo is the area of the photo itself. Calculate the areas of the frame and the photo separately, then subtract the area of the photo from the area of the frame.
【Solution】Solution: $40 \times 32 - 32 \times 28$
$$
\begin{array}{l}
=32 \times (40-28) \\
=32 \times 12 \\
=384 \text{ (square centimeters) }
\end{array}
$$

Answer: The area of the part of the frame not covered by the photo is 384 square centimeters.
Therefore, the answer is: 384.
【Comment】This problem tests the flexible application of the formula for the area of a rectangle.