The CAS Registry Mumber 64768-01-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,7,6 and 8 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 64768-01: (7*6)+(6*4)+(5*7)+(4*6)+(3*8)+(2*0)+(1*1)=150 150 % 10 = 0 So 64768-01-0 is a valid CAS Registry Number.