The CAS Registry Mumber 83735-60-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,7,3 and 5 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 83735-60: (7*8)+(6*3)+(5*7)+(4*3)+(3*5)+(2*6)+(1*0)=148 148 % 10 = 8 So 83735-60-8 is a valid CAS Registry Number.