The CAS Registry Mumber 253170-44-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,3,1,7 and 0 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 253170-44: (8*2)+(7*5)+(6*3)+(5*1)+(4*7)+(3*0)+(2*4)+(1*4)=114 114 % 10 = 4 So 253170-44-4 is a valid CAS Registry Number.
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