The CAS Registry Mumber 111625-10-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,6,2 and 5 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 111625-10: (8*1)+(7*1)+(6*1)+(5*6)+(4*2)+(3*5)+(2*1)+(1*0)=76 76 % 10 = 6 So 111625-10-6 is a valid CAS Registry Number.