The CAS Registry Mumber 790667-32-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,9,0,6,6 and 7 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 790667-32: (8*7)+(7*9)+(6*0)+(5*6)+(4*6)+(3*7)+(2*3)+(1*2)=202 202 % 10 = 2 So 790667-32-2 is a valid CAS Registry Number.