The CAS Registry Mumber 540731-68-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,4,0,7,3 and 1 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 540731-68: (8*5)+(7*4)+(6*0)+(5*7)+(4*3)+(3*1)+(2*6)+(1*8)=138 138 % 10 = 8 So 540731-68-8 is a valid CAS Registry Number.
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