[00:00.30] [00:00.31]Since Roman times, Europeans had been struggling to do simple arithmetic with these [00:12.07]The Hindu or Arabic numerals made all kinds of calculation easier [00:26.19]In particular, Fibonacci showed how the new methods of calculation could be applied to commercial bookkeeping [00:32.69]to currency conversions and, crucially, to the computation of interest [00:38.17]Just imagine trying to work out percentages in Roman numerals [00:42.70]Fibonacci's Liber Abaci made it child's play [00:48.16]This was to be the application of mathematics to making money [00:54.60]