The CAS Registry Mumber 60743-20-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,7,4 and 3 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 60743-20: (7*6)+(6*0)+(5*7)+(4*4)+(3*3)+(2*2)+(1*0)=106 106 % 10 = 6 So 60743-20-6 is a valid CAS Registry Number.