The CAS Registry Mumber 102649-09-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,6,4 and 9 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 102649-09: (8*1)+(7*0)+(6*2)+(5*6)+(4*4)+(3*9)+(2*0)+(1*9)=102 102 % 10 = 2 So 102649-09-2 is a valid CAS Registry Number.
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