The CAS Registry Mumber 101484-15-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,4,8 and 4 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 101484-15: (8*1)+(7*0)+(6*1)+(5*4)+(4*8)+(3*4)+(2*1)+(1*5)=85 85 % 10 = 5 So 101484-15-5 is a valid CAS Registry Number.