The CAS Registry Mumber 89258-06-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,2,5 and 8 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 89258-06: (7*8)+(6*9)+(5*2)+(4*5)+(3*8)+(2*0)+(1*6)=170 170 % 10 = 0 So 89258-06-0 is a valid CAS Registry Number.