The CAS Registry Mumber 139238-04-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,2,3 and 8 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 139238-04: (8*1)+(7*3)+(6*9)+(5*2)+(4*3)+(3*8)+(2*0)+(1*4)=133 133 % 10 = 3 So 139238-04-3 is a valid CAS Registry Number.
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