The CAS Registry Mumber 113242-94-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,2,4 and 2 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 113242-94: (8*1)+(7*1)+(6*3)+(5*2)+(4*4)+(3*2)+(2*9)+(1*4)=87 87 % 10 = 7 So 113242-94-7 is a valid CAS Registry Number.