The CAS Registry Mumber 64959-99-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,9,5 and 9 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 64959-99: (7*6)+(6*4)+(5*9)+(4*5)+(3*9)+(2*9)+(1*9)=185 185 % 10 = 5 So 64959-99-5 is a valid CAS Registry Number.
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