The CAS Registry Mumber 960495-42-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,6,0,4,9 and 5 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 960495-42: (8*9)+(7*6)+(6*0)+(5*4)+(4*9)+(3*5)+(2*4)+(1*2)=195 195 % 10 = 5 So 960495-42-5 is a valid CAS Registry Number.