The CAS Registry Mumber 78092-22-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,0,9 and 2 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 78092-22: (7*7)+(6*8)+(5*0)+(4*9)+(3*2)+(2*2)+(1*2)=145 145 % 10 = 5 So 78092-22-5 is a valid CAS Registry Number.