The CAS Registry Mumber 64960-01-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,9,6 and 0 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 64960-01: (7*6)+(6*4)+(5*9)+(4*6)+(3*0)+(2*0)+(1*1)=136 136 % 10 = 6 So 64960-01-6 is a valid CAS Registry Number.