The CAS Registry Mumber 112444-74-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,4,4 and 4 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 112444-74: (8*1)+(7*1)+(6*2)+(5*4)+(4*4)+(3*4)+(2*7)+(1*4)=93 93 % 10 = 3 So 112444-74-3 is a valid CAS Registry Number.