Coloring in a picture will command your child's full attention, as they concentrate on completing their work, and having the finished product show that they have done their best. This is a welcome assistance for parents who struggle to provide their children with experiences that will captivate their attention, only to find that their little minds and bodies start wandering after only a short time. So as a parent, you gain a short respite as your child works on their coloring page, your child gets to participate in a fun activity that teaches them as well. Which leads me to the next point.
You can even print out some and hold a coloring competition amongst your kids or your class. It is all too common for the coloring sheets that are given out and taken home to become lost, torn, or crumpled up. Obviously such damaged coloring pages are no use for the competition anymore. Parents can be instructed to go online and print out replacement printable coloring pages. It only requires a computer, Internet connection, and a printer to come up with such a contest entry replacement.