The CAS Registry Mumber 97804-61-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,8,0 and 4 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 97804-61: (7*9)+(6*7)+(5*8)+(4*0)+(3*4)+(2*6)+(1*1)=170 170 % 10 = 0 So 97804-61-0 is a valid CAS Registry Number.
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