The CAS Registry Mumber 211803-47-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,1,8,0 and 3 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 211803-47: (8*2)+(7*1)+(6*1)+(5*8)+(4*0)+(3*3)+(2*4)+(1*7)=93 93 % 10 = 3 So 211803-47-3 is a valid CAS Registry Number.
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