The CAS Registry Mumber 85254-00-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,2,5 and 4 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 85254-00: (7*8)+(6*5)+(5*2)+(4*5)+(3*4)+(2*0)+(1*0)=128 128 % 10 = 8 So 85254-00-8 is a valid CAS Registry Number.