The CAS Registry Mumber 77405-59-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,4,0 and 5 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 77405-59: (7*7)+(6*7)+(5*4)+(4*0)+(3*5)+(2*5)+(1*9)=145 145 % 10 = 5 So 77405-59-5 is a valid CAS Registry Number.
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