The CAS Registry Mumber 1374104-95-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,7,4,1,0 and 4 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 1374104-95: (9*1)+(8*3)+(7*7)+(6*4)+(5*1)+(4*0)+(3*4)+(2*9)+(1*5)=146 146 % 10 = 6 So 1374104-95-6 is a valid CAS Registry Number.