I think in addition to these blocks:

(() + ())
(() - ())
(() * ())
(() / ())

We should have

(() ^ ())
(() to the root of ())

RandomPerson1789 wrote:

(() ^ ()) // category=operators

Been suggested… many… times… before…, of course (and that was just picking out the first few turned up by a forum search for “exponent” or “power”).

Sure, it'd be nice to have it right there for easy use - but here's a pretty general custom block for it anyway:

http://scratch.mit.edu/projects/16871883/

RandomPerson1789 wrote:

(() to the root of ()) // category=operators

This is the same as:

( (x) ^ ((1)/(y) ) // category=operators

Or, in the case of using the custom block above:

result = (x) ^ ((1)/(y)  // category=custom

Hope that helps!