The CAS Registry Mumber 101162-51-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,1,6 and 2 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 101162-51: (8*1)+(7*0)+(6*1)+(5*1)+(4*6)+(3*2)+(2*5)+(1*1)=60 60 % 10 = 0 So 101162-51-0 is a valid CAS Registry Number.