The CAS Registry Mumber 85440-74-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,4,4 and 0 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 85440-74: (7*8)+(6*5)+(5*4)+(4*4)+(3*0)+(2*7)+(1*4)=140 140 % 10 = 0 So 85440-74-0 is a valid CAS Registry Number.