The CAS Registry Mumber 1182707-35-2 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,8,2,7,0 and 7 respectively; the second part has 2 digits, 3 and 5 respectively. Calculate Digit Verification of CAS Registry Number 1182707-35: (9*1)+(8*1)+(7*8)+(6*2)+(5*7)+(4*0)+(3*7)+(2*3)+(1*5)=152 152 % 10 = 2 So 1182707-35-2 is a valid CAS Registry Number.