The CAS Registry Mumber 116246-41-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,2,4 and 6 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 116246-41: (8*1)+(7*1)+(6*6)+(5*2)+(4*4)+(3*6)+(2*4)+(1*1)=104 104 % 10 = 4 So 116246-41-4 is a valid CAS Registry Number.