The CAS Registry Mumber 136047-14-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,0,4 and 7 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 136047-14: (8*1)+(7*3)+(6*6)+(5*0)+(4*4)+(3*7)+(2*1)+(1*4)=108 108 % 10 = 8 So 136047-14-8 is a valid CAS Registry Number.