The CAS Registry Mumber 62045-65-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,2,0,4 and 5 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 62045-65: (7*6)+(6*2)+(5*0)+(4*4)+(3*5)+(2*6)+(1*5)=102 102 % 10 = 2 So 62045-65-2 is a valid CAS Registry Number.