The CAS Registry Mumber 86061-02-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,0,6 and 1 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 86061-02: (7*8)+(6*6)+(5*0)+(4*6)+(3*1)+(2*0)+(1*2)=121 121 % 10 = 1 So 86061-02-1 is a valid CAS Registry Number.