2 3 , ▁and ▁− 2 3 . 5 ▁gets ▁rounded ▁to ▁− 2 4 . ▁ ▁Round ▁half ▁towards ▁zero ▁One ▁may ▁also ▁round ▁half ▁towards ▁zero ▁( or ▁round ▁half ▁away ▁from ▁infinity ) ▁as ▁opposed ▁to ▁the ▁conventional ▁round ▁half ▁away ▁from ▁zero . ▁If ▁the ▁fraction ▁of ▁ ▁is ▁exactly ▁ 0 . 5 , ▁then ▁  =    −   0 . 5 ▁if ▁ ▁is ▁positive , ▁and ▁  =    +   0 . 5 ▁if ▁ ▁is ▁negative . ▁ ▁For ▁example , ▁ 2 3 . 5 ▁gets ▁rounded ▁to ▁ 2 3 , ▁and ▁− 2 3 . 5 ▁gets ▁rounded ▁to ▁− 2 3 . ▁ ▁This ▁method ▁tre ats ▁positive ▁and ▁negative ▁values ▁symmet r ically , ▁and ▁therefore ▁is ▁free ▁of ▁overall ▁positive / negative ▁bias ▁if ▁the ▁original ▁numbers ▁are ▁positive ▁or ▁negative ▁with ▁equal ▁probability . ▁It ▁does , ▁however , ▁still ▁have ▁bias ▁towards ▁zero . ▁ ▁Round ▁half ▁away ▁from ▁zero ▁The ▁other ▁tie - bre aking ▁method ▁commonly ▁taught ▁and ▁used ▁is ▁the ▁round ▁half ▁away ▁from ▁zero ▁( or ▁round ▁half ▁towards ▁infinity ), ▁namely : ▁If ▁the ▁fraction ▁of ▁ ▁is ▁exactly ▁ 0 . 5 , ▁then ▁  =    +   0 . 5 ▁if ▁ ▁is ▁positive , ▁and ▁  =    −   0 . 5 ▁if ▁ ▁is ▁negative . ▁ ▁For ▁example , ▁ 2 3 . 5 ▁gets ▁rounded ▁to ▁ 2 4 , ▁and ▁−