The CAS Registry Mumber 10225-00-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,2,2 and 5 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 10225-00: (7*1)+(6*0)+(5*2)+(4*2)+(3*5)+(2*0)+(1*0)=40 40 % 10 = 0 So 10225-00-0 is a valid CAS Registry Number.