The CAS Registry Mumber 1065114-25-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,6,5,1,1 and 4 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 1065114-25: (9*1)+(8*0)+(7*6)+(6*5)+(5*1)+(4*1)+(3*4)+(2*2)+(1*5)=111 111 % 10 = 1 So 1065114-25-1 is a valid CAS Registry Number.