The CAS Registry Mumber 62926-55-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,2,9,2 and 6 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 62926-55: (7*6)+(6*2)+(5*9)+(4*2)+(3*6)+(2*5)+(1*5)=140 140 % 10 = 0 So 62926-55-0 is a valid CAS Registry Number.