The CAS Registry Mumber 130632-75-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,0,6,3 and 2 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 130632-75: (8*1)+(7*3)+(6*0)+(5*6)+(4*3)+(3*2)+(2*7)+(1*5)=96 96 % 10 = 6 So 130632-75-6 is a valid CAS Registry Number.