The CAS Registry Mumber 35965-97-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,5,9,6 and 5 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 35965-97: (7*3)+(6*5)+(5*9)+(4*6)+(3*5)+(2*9)+(1*7)=160 160 % 10 = 0 So 35965-97-0 is a valid CAS Registry Number.