The CAS Registry Mumber 25990-69-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,9,9 and 0 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 25990-69: (7*2)+(6*5)+(5*9)+(4*9)+(3*0)+(2*6)+(1*9)=146 146 % 10 = 6 So 25990-69-6 is a valid CAS Registry Number.
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