The CAS Registry Mumber 16669-42-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,6,6 and 9 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 16669-42: (7*1)+(6*6)+(5*6)+(4*6)+(3*9)+(2*4)+(1*2)=134 134 % 10 = 4 So 16669-42-4 is a valid CAS Registry Number.
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