The CAS Registry Mumber 60681-29-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,6,8 and 1 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 60681-29: (7*6)+(6*0)+(5*6)+(4*8)+(3*1)+(2*2)+(1*9)=120 120 % 10 = 0 So 60681-29-0 is a valid CAS Registry Number.