The CAS Registry Mumber 42109-74-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,1,0 and 9 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 42109-74: (7*4)+(6*2)+(5*1)+(4*0)+(3*9)+(2*7)+(1*4)=90 90 % 10 = 0 So 42109-74-0 is a valid CAS Registry Number.
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