The CAS Registry Mumber 1464-90-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,4,6 and 4 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1464-90: (6*1)+(5*4)+(4*6)+(3*4)+(2*9)+(1*0)=80 80 % 10 = 0 So 1464-90-0 is a valid CAS Registry Number.