This took me a while to figure out.
For some reason you set your "Conversation Match %" and "Discussion Match %" to 10000% in your bot's Learning page. Since no response can have more than a 100% match, this prevents any scripts from evaluating as a match.
The default values for these are 50% for conversation and 90% for discussion, do not set the values to > 100%.
I reset the values, and your bot can do math now.
I would recommend only using the Calculator script that comes from the Bootstrap scripts, the other math scripts are not needed.