Noob Q on possible refutation of Monetarism

Is the following a refutation of the idea that pumping money into and out of the system can influence it?

If pumping money in and out works, it can be done very simply:

To pump money in: Announce on TV that everyone should add a zero to their bills and coins with a sharpie. Their ten dollar bill is now worth 100 dollars, etc. And the banks must do the same to everyone’s bank accounts.

To take money out: Announce on TV that everyone should knock a zero off all their money.

Why won’t this work? And if it won’t, why will pumping money in some other way work better?