The CAS Registry Mumber 18944-21-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,9,4 and 4 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 18944-21: (7*1)+(6*8)+(5*9)+(4*4)+(3*4)+(2*2)+(1*1)=133 133 % 10 = 3 So 18944-21-3 is a valid CAS Registry Number.
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