The CAS Registry Mumber 211294-79-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,1,2,9 and 4 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 211294-79: (8*2)+(7*1)+(6*1)+(5*2)+(4*9)+(3*4)+(2*7)+(1*9)=110 110 % 10 = 0 So 211294-79-0 is a valid CAS Registry Number.