The CAS Registry Mumber 1132702-82-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,3,2,7,0 and 2 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1132702-82: (9*1)+(8*1)+(7*3)+(6*2)+(5*7)+(4*0)+(3*2)+(2*8)+(1*2)=109 109 % 10 = 9 So 1132702-82-9 is a valid CAS Registry Number.