The CAS Registry Mumber 64360-38-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,3,6 and 0 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 64360-38: (7*6)+(6*4)+(5*3)+(4*6)+(3*0)+(2*3)+(1*8)=119 119 % 10 = 9 So 64360-38-9 is a valid CAS Registry Number.