The CAS Registry Mumber 93525-35-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,5,2 and 5 respectively; the second part has 2 digits, 3 and 5 respectively. Calculate Digit Verification of CAS Registry Number 93525-35: (7*9)+(6*3)+(5*5)+(4*2)+(3*5)+(2*3)+(1*5)=140 140 % 10 = 0 So 93525-35-0 is a valid CAS Registry Number.