Calculator Redesign Take 2

Iterating on the previous design. One of the concerns with that was that the process for making a new calculation could be slow if the user were to tap the plus button every time he launched the app.

So now the flow goes like this:
1. User launches the app. And is presented with a new calculation sheet. Where he can get started typing out his calculation.

2. The user can then add stuff like taxes and discounts to his calculations and even drag and rearrange specific numbers.

3. Once the equal to sign is pressed. The result is shown and the calculation saved for later.