The CAS Registry Mumber 92689-46-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,6,8 and 9 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 92689-46: (7*9)+(6*2)+(5*6)+(4*8)+(3*9)+(2*4)+(1*6)=178 178 % 10 = 8 So 92689-46-8 is a valid CAS Registry Number.