The CAS Registry Mumber 79576-70-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,5,7 and 6 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 79576-70: (7*7)+(6*9)+(5*5)+(4*7)+(3*6)+(2*7)+(1*0)=188 188 % 10 = 8 So 79576-70-8 is a valid CAS Registry Number.