The CAS Registry Mumber 55221-73-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,2,2 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 55221-73: (7*5)+(6*5)+(5*2)+(4*2)+(3*1)+(2*7)+(1*3)=103 103 % 10 = 3 So 55221-73-3 is a valid CAS Registry Number.
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