The two forms. Maria makes square tables, then sticks tiles to the top. She uses three types of tiles: whole tiles half tiles quarter tiles The sizes of the square tabletops are all multiples of 10 cm. Maria only uses quarter tiles in the corners and half tiles along the edges of the table. Here is one tabletop: -20 cm 20 cm This square table uses: 5 whole tiles (yellow), 4 half tiles (green), 4 quarter tiles (blue).​