The CAS Registry Mumber 105014-25-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,0,1 and 4 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 105014-25: (8*1)+(7*0)+(6*5)+(5*0)+(4*1)+(3*4)+(2*2)+(1*5)=63 63 % 10 = 3 So 105014-25-3 is a valid CAS Registry Number.