The CAS Registry Mumber 39391-40-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,3,9 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 39391-40: (7*3)+(6*9)+(5*3)+(4*9)+(3*1)+(2*4)+(1*0)=137 137 % 10 = 7 So 39391-40-7 is a valid CAS Registry Number.
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