The CAS Registry Mumber 115125-00-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,1,2 and 5 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 115125-00: (8*1)+(7*1)+(6*5)+(5*1)+(4*2)+(3*5)+(2*0)+(1*0)=73 73 % 10 = 3 So 115125-00-3 is a valid CAS Registry Number.