The CAS Registry Mumber 79697-32-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,6,9 and 7 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 79697-32: (7*7)+(6*9)+(5*6)+(4*9)+(3*7)+(2*3)+(1*2)=198 198 % 10 = 8 So 79697-32-8 is a valid CAS Registry Number.