The CAS Registry Mumber 71558-04-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,5,5 and 8 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 71558-04: (7*7)+(6*1)+(5*5)+(4*5)+(3*8)+(2*0)+(1*4)=128 128 % 10 = 8 So 71558-04-8 is a valid CAS Registry Number.
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