The CAS Registry Mumber 1092094-57-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,9,2,0,9 and 4 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1092094-57: (9*1)+(8*0)+(7*9)+(6*2)+(5*0)+(4*9)+(3*4)+(2*5)+(1*7)=149 149 % 10 = 9 So 1092094-57-9 is a valid CAS Registry Number.