447: Shading a Square

Q1: How many different ways are there to shade this to show ¼?
Q2: How might kids shade this to show ¼?

Source:

Q1: How many different ways are there to shade this to show ¼? Q2: How might kids shade this to show ¼?  pic.twitter.com/vntk6kcYw7
— David Wees (@davidwees) April 25, 2015