#mathhistoryUnmoderated tagAll postsTrending CommunitiesNewcomers' CommunitySteemitCryptoAcademySteemit Feedbackআমার বাংলা ব্লগKorea • 한국 • KR • KOSteem AllianceSTEEM CN/中文AVLE 일상WORLD OF XPILARSteem POD TeamBeauty of CreativityComunidad LatinaExplore Communities...#mathhistoryTrendingHotNewPayoutsMutedxaviorfx (32)in #mathhistory • 6 years ago11-181728 - 828 = 900