The CAS Registry Mumber 90892-92-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,8,9 and 2 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 90892-92: (7*9)+(6*0)+(5*8)+(4*9)+(3*2)+(2*9)+(1*2)=165 165 % 10 = 5 So 90892-92-5 is a valid CAS Registry Number.