The CAS Registry Mumber 67529-10-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,5,2 and 9 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 67529-10: (7*6)+(6*7)+(5*5)+(4*2)+(3*9)+(2*1)+(1*0)=146 146 % 10 = 6 So 67529-10-6 is a valid CAS Registry Number.