The CAS Registry Mumber 38519-24-3 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, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 38519-24: (7*3)+(6*8)+(5*5)+(4*1)+(3*9)+(2*2)+(1*4)=133 133 % 10 = 3 So 38519-24-3 is a valid CAS Registry Number.