Chopping arithmetic on terms such as $\pi^2$, $\pi^3$ or $e^3$ I have a problem where I have to use 3-digit chopping with numbers such as $\pi^2$, $\pi^3$, $e^3$, etc.
If I wanted to 3-digit chop $\pi^2$, do I square the true value of $\pi$ and then chop, or do I chop $\pi$ first to 3.14 then square it?

As a rule of thumb: Always do the chopping / rounding as late as possible.
