The CAS Registry Mumber 38519-39-0 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, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 38519-39: (7*3)+(6*8)+(5*5)+(4*1)+(3*9)+(2*3)+(1*9)=140 140 % 10 = 0 So 38519-39-0 is a valid CAS Registry Number.