The CAS Registry Mumber 141300-07-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,1,3,0 and 0 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 141300-07: (8*1)+(7*4)+(6*1)+(5*3)+(4*0)+(3*0)+(2*0)+(1*7)=64 64 % 10 = 4 So 141300-07-4 is a valid CAS Registry Number.