The CAS Registry Mumber 107325-82-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,7,3,2 and 5 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 107325-82: (8*1)+(7*0)+(6*7)+(5*3)+(4*2)+(3*5)+(2*8)+(1*2)=106 106 % 10 = 6 So 107325-82-6 is a valid CAS Registry Number.