The CAS Registry Mumber 96515-31-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,5,1 and 5 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 96515-31: (7*9)+(6*6)+(5*5)+(4*1)+(3*5)+(2*3)+(1*1)=150 150 % 10 = 0 So 96515-31-0 is a valid CAS Registry Number.