The CAS Registry Mumber 890037-92-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,9,0,0,3 and 7 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 890037-92: (8*8)+(7*9)+(6*0)+(5*0)+(4*3)+(3*7)+(2*9)+(1*2)=180 180 % 10 = 0 So 890037-92-0 is a valid CAS Registry Number.