The CAS Registry Mumber 6092-56-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,0,9 and 2 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 6092-56: (6*6)+(5*0)+(4*9)+(3*2)+(2*5)+(1*6)=94 94 % 10 = 4 So 6092-56-4 is a valid CAS Registry Number.