Brussel's Choice

Here you can play around with Brussels' Choice where you can double or half a number inside of another one. This way you can get from any given number to any other... well almost. Fives and zeros at the end are a bit tricky.

Can you wrap your head around this wierd kind of mathematical operation and reach 1?

"Choix de Bruxelles" was invented by Eric Angelini, a Mathematician from Brussels.