The CAS Registry Mumber 86004-79-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,0,0 and 4 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 86004-79: (7*8)+(6*6)+(5*0)+(4*0)+(3*4)+(2*7)+(1*9)=127 127 % 10 = 7 So 86004-79-7 is a valid CAS Registry Number.