Calculator • Daily UI 4

A calculator that tries to keep the familiarity of the stock iOS calculator while having the ability to 1) view the whole equation and 2) go back to previous calculations.

Didn't think too much about the visual style but it tries to reference paper, where a lot of math is done on. Therefore:
1) The color scheme is white.
2) When tapping the clear (C) button, the numbers fall off the paper as if they're "erased" away.
3) The UI elements are sharp-cornered squares like the shape of a typical letter-size paper.