The CAS Registry Mumber 74610-00-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,6,1 and 0 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 74610-00: (7*7)+(6*4)+(5*6)+(4*1)+(3*0)+(2*0)+(1*0)=107 107 % 10 = 7 So 74610-00-7 is a valid CAS Registry Number.