The CAS Registry Mumber 65276-20-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,2,7 and 6 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 65276-20: (7*6)+(6*5)+(5*2)+(4*7)+(3*6)+(2*2)+(1*0)=132 132 % 10 = 2 So 65276-20-2 is a valid CAS Registry Number.