When an electron is in a superposition of two states it's the sum of two states. When it collapses it collapses to a single state. What happens to the other state? Is it gone and we don't need to worry about it(Copenhagen). Do both states happen in their own universes(MWI)?

So it's not totally incorrect to say 1 becomes two .5s but where in that description is a new universe created? The two states always existed. It sounds like a split when you reduce it to .5+.5=1 but in the superposition both states exist so it's more like .5+.5=(.5+.5). 1 isn't being cleaved in half. It's decohering into it's two states.