The CAS Registry Mumber 38155-01-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,1,5 and 5 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 38155-01: (7*3)+(6*8)+(5*1)+(4*5)+(3*5)+(2*0)+(1*1)=110 110 % 10 = 0 So 38155-01-0 is a valid CAS Registry Number.