The CAS Registry Mumber 40135-04-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,1,3 and 5 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 40135-04: (7*4)+(6*0)+(5*1)+(4*3)+(3*5)+(2*0)+(1*4)=64 64 % 10 = 4 So 40135-04-4 is a valid CAS Registry Number.
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