The CAS Registry Mumber 64469-05-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,4,6 and 9 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 64469-05: (7*6)+(6*4)+(5*4)+(4*6)+(3*9)+(2*0)+(1*5)=142 142 % 10 = 2 So 64469-05-2 is a valid CAS Registry Number.