The CAS Registry Mumber 92422-31-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,4,2 and 2 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 92422-31: (7*9)+(6*2)+(5*4)+(4*2)+(3*2)+(2*3)+(1*1)=116 116 % 10 = 6 So 92422-31-6 is a valid CAS Registry Number.