The CAS Registry Mumber 589-60-6 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,8 and 9 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 589-60: (5*5)+(4*8)+(3*9)+(2*6)+(1*0)=96 96 % 10 = 6 So 589-60-6 is a valid CAS Registry Number.