The CAS Registry Mumber 84605-07-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,6,0 and 5 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 84605-07: (7*8)+(6*4)+(5*6)+(4*0)+(3*5)+(2*0)+(1*7)=132 132 % 10 = 2 So 84605-07-2 is a valid CAS Registry Number.