The CAS Registry Mumber 7219-21-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,2,1 and 9 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 7219-21: (6*7)+(5*2)+(4*1)+(3*9)+(2*2)+(1*1)=88 88 % 10 = 8 So 7219-21-8 is a valid CAS Registry Number.
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