The CAS Registry Mumber 76643-42-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,6,4 and 3 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 76643-42: (7*7)+(6*6)+(5*6)+(4*4)+(3*3)+(2*4)+(1*2)=150 150 % 10 = 0 So 76643-42-0 is a valid CAS Registry Number.
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