The CAS Registry Mumber 125867-96-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,5,8,6 and 7 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 125867-96: (8*1)+(7*2)+(6*5)+(5*8)+(4*6)+(3*7)+(2*9)+(1*6)=161 161 % 10 = 1 So 125867-96-1 is a valid CAS Registry Number.