The CAS Registry Mumber 94127-00-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,1,2 and 7 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 94127-00: (7*9)+(6*4)+(5*1)+(4*2)+(3*7)+(2*0)+(1*0)=121 121 % 10 = 1 So 94127-00-1 is a valid CAS Registry Number.