The CAS Registry Mumber 84605-10-7 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, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 84605-10: (7*8)+(6*4)+(5*6)+(4*0)+(3*5)+(2*1)+(1*0)=127 127 % 10 = 7 So 84605-10-7 is a valid CAS Registry Number.