Mark is covering an 8-inch-square board with 1-inch-square tiles. He uses gray tiles to make four 2-in. by 2-in. squares. He covers the rest of the board with white tiles.

How many more white tiles than gray tiles will Mark use?

Four small rectangles inside a larger rectangle. Two adjacent sides of the larger rectangle are labeled eight inches and eight inches. The four smaller rectangles appear to be the same size and are all shaded. Two adjacent sides of one of the smaller rectangles are labeled two inches and two inches.