Click a green flag. You can drag the sliders for numerator or denominator to choose the (improper) fraction. Click New to get a random (improper) fraction. The purpose is to teach fractions. Also works in Phosphorus i.e. w/o Flash: https://phosphorus.github.io/app.html?id=156805132
I was inspirered by Bråkritaren https://www.geogebra.org/m/PbzcPdyX by Svetlana Yus, a Swedish math teacher. This is a modification of Fraction Roller https://scratch.mit.edu/projects/153790703/ . This uses pi = 3.14159...