Added arithmetic methods to number classes
Added arithmetic methods to number classes

toolforger/sympy,mafiya69/sympy,abhiii5459/sympy,jamesblunt/sympy,moble/sympy,flacjacket/sympy,AunShiLord/sympy,amitjamadagni/sympy,Davidjohnwilson/sympy,atreyv/sympy,jbbskinny/sympy,lidavidm/sympy,Sumith1896/sympy,oliverlee/sympy,MridulS/sympy,drufat/sympy,kaushik94/sympy,kaushik94/sympy,garvitr/sympy,aktech/sympy,VaibhavAgarwalVA/sympy,debugger22/sympy,pbrady/sympy,sunny94/temp,kaushik94/sympy,yukoba/sympy,Gadal/sympy,meghana1995/sympy,Shaswat27/sympy,saurabhjn76/sympy,MridulS/sympy,Curious72/sympy,liangjiaxing/sympy,sunny94/temp,atreyv/sympy,sahmed95/sympy,mafiya69/sympy,rahuldan/sympy,Davidjohnwilson/sympy,atsao72/sympy,kaichogami/sympy,Arafatk/sympy,farhaanbukhsh/sympy,yashsharan/sympy,vipulroxx/sympy,AkademieOlympia/sympy,abloomston/sympy,souravsingh/sympy,lindsayad/sympy,abhiii5459/sympy,kumarkrishna/sympy,jerli/sympy,grevutiu-gabriel/sympy,Shaswat27/sympy,Designist/sympy,pandeyadarsh/sympy,hrashk/sympy,wanglongqi/sympy,ga7g08/sympy,amitjamadagni/sympy,ahhda/sympy,atsao72/sympy,ahhda/sympy,lindsayad/sympy,sahilshekhawat/sympy,postvakje/sympy,ChristinaZografou/sympy,Gadal/sympy,shikil/sympy,toolforger/sympy,skidzo/sympy,mcdaniel67/sympy,dqnykamp/sympy,postvakje/sympy,Davidjohnwilson/sympy,VaibhavAgarwalVA/sympy,jerli/sympy,shipci/sympy,dqnykamp/sympy,beni55/sympy,liangjiaxing/sympy,hargup/sympy,ChristinaZografou/sympy,maniteja123/sympy,emon10005/sympy,postvakje/sympy,ga7g08/sympy,jamesblunt/sympy,bukzor/sympy,rahuldan/sympy,kaichogami/sympy,ahhda/sympy,oliverlee/sympy,chaffra/sympy,hrashk/sympy,asm666/sympy,vipulroxx/sympy,Titan-C/sympy,aktech/sympy,MechCoder/sympy,AunShiLord/sympy,debugger22/sympy,jaimahajan1997/sympy,iamutkarshtiwari/sympy,kmacinnis/sympy,atsao72/sympy,jaimahajan1997/sympy,Mitchkoens/sympy,aktech/sympy,debugger22/sympy,meghana1995/sympy,saurabhjn76/sympy,wyom/sympy,oliverlee/sympy,farhaanbukhsh/sympy,madan96/sympy,MechCoder/sympy,AkademieOlympia/sympy,pandeyadarsh/sympy,Mitchkoens/sympy,moble/sympy,yashsharan/sympy,maniteja123/sympy,kevalds51/sympy,Designist/sympy,kevalds51/sympy,emon10005/sympy,emon10005/sympy,wanglongqi/sympy,jaimahajan1997/sympy,yukoba/sympy,hrashk/sympy,moble/sympy,dqnykamp/sympy,abloomston/sympy,sahmed95/sympy,VaibhavAgarwalVA/sympy,kevalds51/sympy,skidzo/sympy,sahmed95/sympy,sahilshekhawat/sympy,toolforger/sympy,cswiercz/sympy,Vishluck/sympy,Curious72/sympy,Titan-C/sympy,sampadsaha5/sympy,atreyv/sympy,wanglongqi/sympy,cccfran/sympy,Curious72/sympy,pandeyadarsh/sympy,mafiya69/sympy,srjoglekar246/sympy,maniteja123/sympy,shipci/sympy,grevutiu-gabriel/sympy,vipulroxx/sympy,cswiercz/sympy,farhaanbukhsh/sympy,Arafatk/sympy,lidavidm/sympy,chaffra/sympy,Titan-C/sympy,shikil/sympy,lidavidm/sympy,sampadsaha5/sympy,sampadsaha5/sympy,ChristinaZografou/sympy,jamesblunt/sympy,jbbskinny/sympy,Shaswat27/sympy,Gadal/sympy,Sumith1896/sympy,wyom/sympy,Designist/sympy,kaichogami/sympy,chaffra/sympy,MridulS/sympy,madan96/sympy,iamutkarshtiwari/sympy,drufat/sympy,pbrady/sympy,drufat/sympy,MechCoder/sympy,sunny94/temp,sahilshekhawat/sympy,hargup/sympy,abloomston/sympy,skidzo/sympy,garvitr/sympy,asm666/sympy,bukzor/sympy,meghana1995/sympy,pbrady/sympy,ga7g08/sympy,grevutiu-gabriel/sympy,jerli/sympy,Vishluck/sympy,bukzor/sympy,AkademieOlympia/sympy,skirpichev/omg,kumarkrishna/sympy,AunShiLord/sympy,yashsharan/sympy,cccfran/sympy,souravsingh/sympy,hargup/sympy,Mitchkoens/sympy,Vishluck/sympy,asm666/sympy,beni55/sympy,kmacinnis/sympy,beni55/sympy,cccfran/sympy,mcdaniel67/sympy,cswiercz/sympy,rahuldan/sympy,souravsingh/sympy,mcdaniel67/sympy,Arafatk/sympy,jbbskinny/sympy,liangjiaxing/sympy,madan96/sympy,garvitr/sympy,shikil/sympy,kmacinnis/sympy,wyom/sympy,saurabhjn76/sympy,iamutkarshtiwari/sympy,kumarkrishna/sympy,shipci/sympy,lindsayad/sympy,abhiii5459/sympy,diofant/diofant,yukoba/sympy,Sumith1896/sympy