The CAS Registry Mumber 79700-95-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,7,0 and 0 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 79700-95: (7*7)+(6*9)+(5*7)+(4*0)+(3*0)+(2*9)+(1*5)=161 161 % 10 = 1 So 79700-95-1 is a valid CAS Registry Number.