The CAS Registry Mumber 120876-32-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,8,7 and 6 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 120876-32: (8*1)+(7*2)+(6*0)+(5*8)+(4*7)+(3*6)+(2*3)+(1*2)=116 116 % 10 = 6 So 120876-32-6 is a valid CAS Registry Number.