The CAS Registry Mumber 150357-75-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,0,3,5 and 7 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 150357-75: (8*1)+(7*5)+(6*0)+(5*3)+(4*5)+(3*7)+(2*7)+(1*5)=118 118 % 10 = 8 So 150357-75-8 is a valid CAS Registry Number.