The CAS Registry Mumber 115062-66-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,0,6 and 2 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 115062-66: (8*1)+(7*1)+(6*5)+(5*0)+(4*6)+(3*2)+(2*6)+(1*6)=93 93 % 10 = 3 So 115062-66-3 is a valid CAS Registry Number.