The CAS Registry Mumber 82762-61-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,7,6 and 2 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 82762-61: (7*8)+(6*2)+(5*7)+(4*6)+(3*2)+(2*6)+(1*1)=146 146 % 10 = 6 So 82762-61-6 is a valid CAS Registry Number.