The CAS Registry Mumber 132149-51-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,1,4 and 9 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 132149-51: (8*1)+(7*3)+(6*2)+(5*1)+(4*4)+(3*9)+(2*5)+(1*1)=100 100 % 10 = 0 So 132149-51-0 is a valid CAS Registry Number.