Home Slickdeals Secrets of Mental Math: The Mathemagician’s Guide to Lightning Calculation and Amazing... Slickdeals Secrets of Mental Math: The Mathemagician’s Guide to Lightning Calculation and Amazing Math Tricks $2 By ARCOM - 2 February 2018 157 0 SHARE Facebook Twitter Go to the deal page: Secrets of Mental Math: The Mathemagician’s Guide to Lightning Calculation and Amazing Math Tricks $2