The CAS Registry Mumber 93363-70-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,3,6 and 3 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 93363-70: (7*9)+(6*3)+(5*3)+(4*6)+(3*3)+(2*7)+(1*0)=143 143 % 10 = 3 So 93363-70-3 is a valid CAS Registry Number.