The CAS Registry Mumber 27951-55-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,9,5 and 1 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 27951-55: (7*2)+(6*7)+(5*9)+(4*5)+(3*1)+(2*5)+(1*5)=139 139 % 10 = 9 So 27951-55-9 is a valid CAS Registry Number.
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