The CAS Registry Mumber 1241990-12-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,1,9,9 and 0 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1241990-12: (9*1)+(8*2)+(7*4)+(6*1)+(5*9)+(4*9)+(3*0)+(2*1)+(1*2)=144 144 % 10 = 4 So 1241990-12-4 is a valid CAS Registry Number.
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