The CAS Registry Mumber 639498-98-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,9,4,9 and 8 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 639498-98: (8*6)+(7*3)+(6*9)+(5*4)+(4*9)+(3*8)+(2*9)+(1*8)=229 229 % 10 = 9 So 639498-98-9 is a valid CAS Registry Number.
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