The CAS Registry Mumber 157888-63-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,8,8 and 8 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 157888-63: (8*1)+(7*5)+(6*7)+(5*8)+(4*8)+(3*8)+(2*6)+(1*3)=196 196 % 10 = 6 So 157888-63-6 is a valid CAS Registry Number.
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