The CAS Registry Mumber 76795-58-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,7,9 and 5 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 76795-58: (7*7)+(6*6)+(5*7)+(4*9)+(3*5)+(2*5)+(1*8)=189 189 % 10 = 9 So 76795-58-9 is a valid CAS Registry Number.