The CAS Registry Mumber 133268-41-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,2,6 and 8 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 133268-41: (8*1)+(7*3)+(6*3)+(5*2)+(4*6)+(3*8)+(2*4)+(1*1)=114 114 % 10 = 4 So 133268-41-4 is a valid CAS Registry Number.
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