The CAS Registry Mumber 53247-50-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,2,4 and 7 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 53247-50: (7*5)+(6*3)+(5*2)+(4*4)+(3*7)+(2*5)+(1*0)=110 110 % 10 = 0 So 53247-50-0 is a valid CAS Registry Number.