A rectangular cardboard is 56 mm by 10 mm. A square of side 2 mm is cut from it. What area remains?
Note
First find the rectangle area: 56 × 10 = 560. The cut-out square area is 2 × 2 = 4. Remaining area = 560 − 4 = 556 square mm. For composite figures, split the shape into simple parts or subtract the removed part. Here the square is cut out, so its area must be subtracted from the rectangle area, not added. So the correct choice is 556 mm².