The CAS Registry Mumber 79968-06-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,9,6 and 8 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 79968-06: (7*7)+(6*9)+(5*9)+(4*6)+(3*8)+(2*0)+(1*6)=202 202 % 10 = 2 So 79968-06-2 is a valid CAS Registry Number.