▁of ▁a ▁doll ar , ▁to ▁whole ▁multi ples ▁of ▁ 1 / 2 ▁or ▁ 1 / 8   inch , ▁to ▁whole ▁do z ens ▁or ▁thousands , ▁etc . ▁ ▁In ▁general , ▁round ing ▁a ▁number ▁ ▁to ▁a ▁multiple ▁of ▁some ▁specified ▁positive ▁value ▁ ▁ent ails ▁the ▁following ▁steps : ▁ ▁For ▁example , ▁round ing ▁  =   2 . 1 7 8 4 ▁dollars ▁to ▁whole ▁c ents ▁( i . e ., ▁to ▁a ▁multiple ▁of ▁ 0 . 0 1 ) ▁ent ails ▁computing ▁ 2 . 1 7 8 4   /   0 . 0 1   =   2 1 7 . 8 4 , ▁then ▁round ing ▁that ▁to ▁ 2 1 8 , ▁and ▁finally ▁computing ▁ 2 1 8   ×   0 . 0 1   =   2 . 1 8 . ▁ ▁When ▁round ing ▁to ▁a ▁pred et erm ined ▁number ▁of ▁significant ▁digits , ▁the ▁increment ▁ ▁depends ▁on ▁the ▁magnitude ▁of ▁the ▁number ▁to ▁be ▁rounded ▁( or ▁of ▁the ▁rounded ▁result ). ▁ ▁The ▁increment ▁ ▁is ▁normally ▁a ▁finite ▁fraction ▁in ▁whatever ▁numer al ▁system ▁is ▁used ▁to ▁represent ▁the ▁numbers . ▁For ▁display ▁to ▁humans , ▁that ▁usually ▁means ▁the ▁decimal ▁numer al ▁system ▁( that ▁is , ▁ ▁is ▁an ▁integer ▁times ▁a ▁power ▁of ▁ 1 0 , ▁like ▁ 1 / 1 0 0 0 ▁or ▁ 2 5 / 1 0 0 ). ▁For