The CAS Registry Mumber 38519-97-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,5,1 and 9 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 38519-97: (7*3)+(6*8)+(5*5)+(4*1)+(3*9)+(2*9)+(1*7)=150 150 % 10 = 0 So 38519-97-0 is a valid CAS Registry Number.