Look at the number Mod 1. When you look at a number Mod n, you just divide by n, and look at the remainder. So here you divide by 1, and the remainder is just the fractional part. The best way to do this depends on the language.
Simple paint a long horizontal black stroke on a scratch piece of paper and then once it dries paint your watercolors colors in short vertical strokes on top of it. If the paint appears to sit on top of the black stroke the paint is opaque.
Slate Blue Borrow from a cloudy sky, and paint your bedroom a soothing hue of slate blue. Why we love it: Slate blue goes from dreary to dreamy when combined with creamy white and sunny yellow. Paint color name: Valspar Illusion Blue.