The CAS Registry Mumber 1142192-62-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,4,2,1,9 and 2 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1142192-62: (9*1)+(8*1)+(7*4)+(6*2)+(5*1)+(4*9)+(3*2)+(2*6)+(1*2)=118 118 % 10 = 8 So 1142192-62-8 is a valid CAS Registry Number.