#mathhistoryUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemitCryptoAcademySteemit Feedbackআমার বাংলা ব্লগKorea • 한국 • KR • KOSteem AllianceSTEEM CN/中文Comunidad LatinaTron Fan ClubBeauty of CreativityAVLE 일상Steem POD Team#mathhistoryTrendingHotNewPayoutsMutedxaviorfx (32)in #mathhistory • 7 years ago11-181728 - 828 = 900