The CAS Registry Mumber 96105-49-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,1,0 and 5 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 96105-49: (7*9)+(6*6)+(5*1)+(4*0)+(3*5)+(2*4)+(1*9)=136 136 % 10 = 6 So 96105-49-6 is a valid CAS Registry Number.