The CAS Registry Mumber 132252-90-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,2,5 and 2 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 132252-90: (8*1)+(7*3)+(6*2)+(5*2)+(4*5)+(3*2)+(2*9)+(1*0)=95 95 % 10 = 5 So 132252-90-5 is a valid CAS Registry Number.