The CAS Registry Mumber 207691-69-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,7,6,9 and 1 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 207691-69: (8*2)+(7*0)+(6*7)+(5*6)+(4*9)+(3*1)+(2*6)+(1*9)=148 148 % 10 = 8 So 207691-69-8 is a valid CAS Registry Number.
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