The CAS Registry Mumber 226910-72-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,6,9,1 and 0 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 226910-72: (8*2)+(7*2)+(6*6)+(5*9)+(4*1)+(3*0)+(2*7)+(1*2)=131 131 % 10 = 1 So 226910-72-1 is a valid CAS Registry Number.
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