The CAS Registry Mumber 885268-78-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,5,2,6 and 8 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 885268-78: (8*8)+(7*8)+(6*5)+(5*2)+(4*6)+(3*8)+(2*7)+(1*8)=230 230 % 10 = 0 So 885268-78-0 is a valid CAS Registry Number.