The CAS Registry Mumber 95240-86-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,2,4 and 0 respectively; the second part has 2 digits, 8 and 6 respectively. Calculate Digit Verification of CAS Registry Number 95240-86: (7*9)+(6*5)+(5*2)+(4*4)+(3*0)+(2*8)+(1*6)=141 141 % 10 = 1 So 95240-86-1 is a valid CAS Registry Number.