The CAS Registry Mumber 92311-60-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,3,1 and 1 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 92311-60: (7*9)+(6*2)+(5*3)+(4*1)+(3*1)+(2*6)+(1*0)=109 109 % 10 = 9 So 92311-60-9 is a valid CAS Registry Number.