Bre ak fast ▁c ere al ▁companies ▁Category : Comp an ies ▁based ▁in ▁Bed ford shire ▁Category : F ood ▁and ▁drink ▁companies ▁established ▁in ▁ 1 8 5 5 ▁Category : C ere al ▁bars ▁Category : Organ ic ▁far ming ▁organizations ▁Category : B rit ish ▁br ands ▁Category : F ood ▁manufact ur ers ▁of ▁the ▁United ▁Kingdom <0x0A> </s> ▁In ▁mathematics , ▁a ▁real ▁number ▁is ▁a ▁value ▁of ▁a ▁continuous ▁quantity ▁that ▁can ▁represent ▁a ▁distance ▁along ▁a ▁line . ▁The ▁ad jective ▁real ▁in ▁this ▁context ▁was ▁introduced ▁in ▁the ▁ 1 7 th ▁century ▁by ▁René ▁Des cart es , ▁who ▁distinguished ▁between ▁real ▁and ▁imag inary ▁roots ▁of ▁polynomials . ▁The ▁real ▁numbers ▁include ▁all ▁the ▁rational ▁numbers , ▁such ▁as ▁the ▁integer ▁− 5 ▁and ▁the ▁fraction ▁ 4 / 3 , ▁and ▁all ▁the ▁ir r ational ▁numbers , ▁such ▁as ▁ ▁( 1 . 4 1 4 2 1 3 5 6 ..., ▁the ▁square ▁root ▁of ▁ 2 , ▁an ▁ir r ational ▁algebraic ▁number ). ▁ ▁In cluded ▁within ▁the ▁ir r ational s ▁are ▁the ▁trans c endent al ▁numbers , ▁such ▁as ▁ ▁( 3 . 1 4 1 5 9 2 6 5 ... ). ▁▁ ▁In ▁addition ▁to ▁meas uring ▁distance , ▁real ▁numbers ▁can ▁be ▁used ▁to ▁measure ▁quantities ▁such ▁as ▁time , ▁mass , ▁energy , ▁velocity , ▁and ▁many ▁more . ▁ ▁Real ▁numbers ▁can ▁be ▁thought ▁of ▁as ▁points ▁on ▁an