The CAS Registry Mumber 66958-77-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,9,5 and 8 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 66958-77: (7*6)+(6*6)+(5*9)+(4*5)+(3*8)+(2*7)+(1*7)=188 188 % 10 = 8 So 66958-77-8 is a valid CAS Registry Number.
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