The CAS Registry Mumber 152192-85-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,2,1,9 and 2 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 152192-85: (8*1)+(7*5)+(6*2)+(5*1)+(4*9)+(3*2)+(2*8)+(1*5)=123 123 % 10 = 3 So 152192-85-3 is a valid CAS Registry Number.