Things are too complex

I have decided that we make things too hard for ourselves and I have come up with a solution to identify if things are wrong.

My daughter is almost 3 and like most 3 year olds she is asking about things, I explain to her and she either understands or doesn't, so this rule of thumb should be used from now on, if a 3 year old can understand it... its fine, if not it's too complex and should be reworked.

I use an example, British coins, why are £1 smaller than 2p or 50p ?, explain that to a child, that the small little £1 is actually worth more than the 2p, you can't, why ? because its stupid.