The CAS Registry Mumber 54810-29-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,8,1 and 0 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 54810-29: (7*5)+(6*4)+(5*8)+(4*1)+(3*0)+(2*2)+(1*9)=116 116 % 10 = 6 So 54810-29-6 is a valid CAS Registry Number.