The CAS Registry Mumber 69152-10-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,1,5 and 2 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 69152-10: (7*6)+(6*9)+(5*1)+(4*5)+(3*2)+(2*1)+(1*0)=129 129 % 10 = 9 So 69152-10-9 is a valid CAS Registry Number.