The CAS Registry Mumber 18825-10-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,8,2 and 5 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 18825-10: (7*1)+(6*8)+(5*8)+(4*2)+(3*5)+(2*1)+(1*0)=120 120 % 10 = 0 So 18825-10-0 is a valid CAS Registry Number.