The CAS Registry Mumber 100692-79-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,0,6,9 and 2 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 100692-79: (8*1)+(7*0)+(6*0)+(5*6)+(4*9)+(3*2)+(2*7)+(1*9)=103 103 % 10 = 3 So 100692-79-3 is a valid CAS Registry Number.