The CAS Registry Mumber 154702-08-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,4,7,0 and 2 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 154702-08: (8*1)+(7*5)+(6*4)+(5*7)+(4*0)+(3*2)+(2*0)+(1*8)=116 116 % 10 = 6 So 154702-08-6 is a valid CAS Registry Number.