The CAS Registry Mumber 3906-90-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,9,0 and 6 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 3906-90: (6*3)+(5*9)+(4*0)+(3*6)+(2*9)+(1*0)=99 99 % 10 = 9 So 3906-90-9 is a valid CAS Registry Number.
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