The CAS Registry Mumber 57960-08-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,9,6 and 0 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 57960-08: (7*5)+(6*7)+(5*9)+(4*6)+(3*0)+(2*0)+(1*8)=154 154 % 10 = 4 So 57960-08-4 is a valid CAS Registry Number.