The CAS Registry Mumber 77515-04-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,5,1 and 5 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 77515-04: (7*7)+(6*7)+(5*5)+(4*1)+(3*5)+(2*0)+(1*4)=139 139 % 10 = 9 So 77515-04-9 is a valid CAS Registry Number.
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