The CAS Registry Mumber 189745-70-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,7,4 and 5 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 189745-70: (8*1)+(7*8)+(6*9)+(5*7)+(4*4)+(3*5)+(2*7)+(1*0)=198 198 % 10 = 8 So 189745-70-8 is a valid CAS Registry Number.
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