The CAS Registry Mumber 67771-98-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,7,7 and 1 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 67771-98: (7*6)+(6*7)+(5*7)+(4*7)+(3*1)+(2*9)+(1*8)=176 176 % 10 = 6 So 67771-98-6 is a valid CAS Registry Number.
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