The CAS Registry Mumber 76069-71-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,0,6 and 9 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 76069-71: (7*7)+(6*6)+(5*0)+(4*6)+(3*9)+(2*7)+(1*1)=151 151 % 10 = 1 So 76069-71-1 is a valid CAS Registry Number.