The CAS Registry Mumber 10574-10-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,5,7 and 4 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 10574-10: (7*1)+(6*0)+(5*5)+(4*7)+(3*4)+(2*1)+(1*0)=74 74 % 10 = 4 So 10574-10-4 is a valid CAS Registry Number.