The CAS Registry Mumber 120679-02-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,6,7 and 9 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 120679-02: (8*1)+(7*2)+(6*0)+(5*6)+(4*7)+(3*9)+(2*0)+(1*2)=109 109 % 10 = 9 So 120679-02-9 is a valid CAS Registry Number.