The CAS Registry Mumber 24157-07-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,4,1,5 and 7 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 24157-07: (7*2)+(6*4)+(5*1)+(4*5)+(3*7)+(2*0)+(1*7)=91 91 % 10 = 1 So 24157-07-1 is a valid CAS Registry Number.
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