The CAS Registry Mumber 331944-63-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,3,1,9,4 and 4 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 331944-63: (8*3)+(7*3)+(6*1)+(5*9)+(4*4)+(3*4)+(2*6)+(1*3)=139 139 % 10 = 9 So 331944-63-9 is a valid CAS Registry Number.
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