The CAS Registry Mumber 934-35-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,3 and 4 respectively; the second part has 2 digits, 3 and 5 respectively. Calculate Digit Verification of CAS Registry Number 934-35: (5*9)+(4*3)+(3*4)+(2*3)+(1*5)=80 80 % 10 = 0 So 934-35-0 is a valid CAS Registry Number.