The CAS Registry Mumber 7756-97-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,5 and 6 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 7756-97: (6*7)+(5*7)+(4*5)+(3*6)+(2*9)+(1*7)=140 140 % 10 = 0 So 7756-97-0 is a valid CAS Registry Number.
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