The CAS Registry Mumber 159624-03-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,6,2 and 4 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 159624-03: (8*1)+(7*5)+(6*9)+(5*6)+(4*2)+(3*4)+(2*0)+(1*3)=150 150 % 10 = 0 So 159624-03-0 is a valid CAS Registry Number.