The CAS Registry Mumber 110454-63-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,0,4,5 and 4 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 110454-63: (8*1)+(7*1)+(6*0)+(5*4)+(4*5)+(3*4)+(2*6)+(1*3)=82 82 % 10 = 2 So 110454-63-2 is a valid CAS Registry Number.