The CAS Registry Mumber 188938-33-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,9,3 and 8 respectively; the second part has 2 digits, 3 and 3 respectively. Calculate Digit Verification of CAS Registry Number 188938-33: (8*1)+(7*8)+(6*8)+(5*9)+(4*3)+(3*8)+(2*3)+(1*3)=202 202 % 10 = 2 So 188938-33-2 is a valid CAS Registry Number.
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