The CAS Registry Mumber 147605-13-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,7,6,0 and 5 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 147605-13: (8*1)+(7*4)+(6*7)+(5*6)+(4*0)+(3*5)+(2*1)+(1*3)=128 128 % 10 = 8 So 147605-13-8 is a valid CAS Registry Number.