The CAS Registry Mumber 116206-94-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,2,0 and 6 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 116206-94: (8*1)+(7*1)+(6*6)+(5*2)+(4*0)+(3*6)+(2*9)+(1*4)=101 101 % 10 = 1 So 116206-94-1 is a valid CAS Registry Number.