I am a hobbyist and lurker, love this site btw....I think I have heard of a multiplication effect where 3 separate 3 digit numbers are given and the performer quickly gives the sum and the product of the three...Has anyone heard of this, and does it have a name or do you know of a source to buy....

Thank you.

John

Sounds like something you might find in a Martin Gardner book, but I don't know it off the top of my head.

It may also use a Kozar prediction pad or something similar.
I did this trick recently using that.