The CAS Registry Mumber 60727-73-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,7,2 and 7 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 60727-73: (7*6)+(6*0)+(5*7)+(4*2)+(3*7)+(2*7)+(1*3)=123 123 % 10 = 3 So 60727-73-3 is a valid CAS Registry Number.