The CAS Registry Mumber 138937-68-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,9,3 and 7 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 138937-68: (8*1)+(7*3)+(6*8)+(5*9)+(4*3)+(3*7)+(2*6)+(1*8)=175 175 % 10 = 5 So 138937-68-5 is a valid CAS Registry Number.
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