The CAS Registry Mumber 66885-31-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,8,8 and 5 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 66885-31: (7*6)+(6*6)+(5*8)+(4*8)+(3*5)+(2*3)+(1*1)=172 172 % 10 = 2 So 66885-31-2 is a valid CAS Registry Number.
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