The CAS Registry Mumber 122600-44-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,6,0 and 0 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 122600-44: (8*1)+(7*2)+(6*2)+(5*6)+(4*0)+(3*0)+(2*4)+(1*4)=76 76 % 10 = 6 So 122600-44-6 is a valid CAS Registry Number.