The CAS Registry Mumber 150059-50-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,0,0,5 and 9 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 150059-50: (8*1)+(7*5)+(6*0)+(5*0)+(4*5)+(3*9)+(2*5)+(1*0)=100 100 % 10 = 0 So 150059-50-0 is a valid CAS Registry Number.