The CAS Registry Mumber 91770-69-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,7,7 and 0 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 91770-69: (7*9)+(6*1)+(5*7)+(4*7)+(3*0)+(2*6)+(1*9)=153 153 % 10 = 3 So 91770-69-3 is a valid CAS Registry Number.
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