The CAS Registry Mumber 62936-62-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,2,9,3 and 6 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 62936-62: (7*6)+(6*2)+(5*9)+(4*3)+(3*6)+(2*6)+(1*2)=143 143 % 10 = 3 So 62936-62-3 is a valid CAS Registry Number.