The CAS Registry Mumber 64036-02-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,0,3 and 6 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 64036-02: (7*6)+(6*4)+(5*0)+(4*3)+(3*6)+(2*0)+(1*2)=98 98 % 10 = 8 So 64036-02-8 is a valid CAS Registry Number.