The CAS Registry Mumber 93046-20-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,0,4 and 6 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 93046-20: (7*9)+(6*3)+(5*0)+(4*4)+(3*6)+(2*2)+(1*0)=119 119 % 10 = 9 So 93046-20-9 is a valid CAS Registry Number.