The CAS Registry Mumber 80472-50-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,4,7 and 2 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 80472-50: (7*8)+(6*0)+(5*4)+(4*7)+(3*2)+(2*5)+(1*0)=120 120 % 10 = 0 So 80472-50-0 is a valid CAS Registry Number.