The CAS Registry Mumber 760-75-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 7,6 and 0 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 760-75: (5*7)+(4*6)+(3*0)+(2*7)+(1*5)=78 78 % 10 = 8 So 760-75-8 is a valid CAS Registry Number.