The CAS Registry Mumber 15150-76-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,1,5 and 0 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 15150-76: (7*1)+(6*5)+(5*1)+(4*5)+(3*0)+(2*7)+(1*6)=82 82 % 10 = 2 So 15150-76-2 is a valid CAS Registry Number.