The CAS Registry Mumber 194796-30-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,4,7,9 and 6 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 194796-30: (8*1)+(7*9)+(6*4)+(5*7)+(4*9)+(3*6)+(2*3)+(1*0)=190 190 % 10 = 0 So 194796-30-0 is a valid CAS Registry Number.