I think this (and its pair by Jean-Michelle) is the best plugin for moodle, with this plugin all needs of elementary maths (+physiscs/chem) can be solved easily.
One question is on the design side: how (if anyhow) can I change the size (width or length) of answer boxes ? the _1, _2 etc
In most cases the simple numerical answers needs only 2-6 digits, but the input box is 20-25 digit long, so it is very hard to implement an inline question with this size.
thx for support !