Take a piece of paper and fold it four times lengthwise. Then fold it once again width-wise, so when you open it back up you have 8 rectangles on your sheet in a 4×2 pattern. Now color with crayons or paint with watercolors in this way: Paint 2/8 one color. Now paint 1/8 a second color. With the third color you choose, paint 3/8. Now here is a tricky question: How many fourths are left uncolored? Color them with a fourth color.