The CAS Registry Mumber 64696-01-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,6,9 and 6 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 64696-01: (7*6)+(6*4)+(5*6)+(4*9)+(3*6)+(2*0)+(1*1)=151 151 % 10 = 1 So 64696-01-1 is a valid CAS Registry Number.