The CAS Registry Mumber 12192-37-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,1,9 and 2 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 12192-37: (7*1)+(6*2)+(5*1)+(4*9)+(3*2)+(2*3)+(1*7)=79 79 % 10 = 9 So 12192-37-9 is a valid CAS Registry Number.