The CAS Registry Mumber 96204-70-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,2,0 and 4 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 96204-70: (7*9)+(6*6)+(5*2)+(4*0)+(3*4)+(2*7)+(1*0)=135 135 % 10 = 5 So 96204-70-5 is a valid CAS Registry Number.