The CAS Registry Mumber 85916-60-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,9,1 and 6 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 85916-60: (7*8)+(6*5)+(5*9)+(4*1)+(3*6)+(2*6)+(1*0)=165 165 % 10 = 5 So 85916-60-5 is a valid CAS Registry Number.