1 pound = 240d divides evenly by 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, etc.. And it's good for practicing arithmetic. ;-) [The Wizarding Currency of the Harry

1 pound = 240d divides evenly by 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, etc.. And it's good for practicing arithmetic. ;-) [The Wizarding Currency of the Harry Potter series was presumably a parody of this but based on 1g = 17s*29k = 493k; 17 and 29 being somewhat less useful divisors, though in practice one could presumably divide physical quantities by 18 or 30 and price on the 17 or 29 scale. 29 does have the occasionally useful property of being the number of days in February in a leap year.]