The CAS Registry Mumber 101401-31-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,4,0 and 1 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 101401-31: (8*1)+(7*0)+(6*1)+(5*4)+(4*0)+(3*1)+(2*3)+(1*1)=44 44 % 10 = 4 So 101401-31-4 is a valid CAS Registry Number.
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