The CAS Registry Mumber 60736-72-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,7,3 and 6 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 60736-72: (7*6)+(6*0)+(5*7)+(4*3)+(3*6)+(2*7)+(1*2)=123 123 % 10 = 3 So 60736-72-3 is a valid CAS Registry Number.