The CAS Registry Mumber 152489-36-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,2,4,8 and 9 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 152489-36: (8*1)+(7*5)+(6*2)+(5*4)+(4*8)+(3*9)+(2*3)+(1*6)=146 146 % 10 = 6 So 152489-36-6 is a valid CAS Registry Number.