The CAS Registry Mumber 61448-32-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,1,4,4 and 8 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 61448-32: (7*6)+(6*1)+(5*4)+(4*4)+(3*8)+(2*3)+(1*2)=116 116 % 10 = 6 So 61448-32-6 is a valid CAS Registry Number.