The CAS Registry Mumber 752-67-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 7,5 and 2 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 752-67: (5*7)+(4*5)+(3*2)+(2*6)+(1*7)=80 80 % 10 = 0 So 752-67-0 is a valid CAS Registry Number.