The CAS Registry Mumber 1256339-71-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,5,6,3,3 and 9 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1256339-71: (9*1)+(8*2)+(7*5)+(6*6)+(5*3)+(4*3)+(3*9)+(2*7)+(1*1)=165 165 % 10 = 5 So 1256339-71-5 is a valid CAS Registry Number.
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