The CAS Registry Mumber 98847-00-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,8,4 and 7 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 98847-00: (7*9)+(6*8)+(5*8)+(4*4)+(3*7)+(2*0)+(1*0)=188 188 % 10 = 8 So 98847-00-8 is a valid CAS Registry Number.