The CAS Registry Mumber 7376-07-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,3,7 and 6 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 7376-07: (6*7)+(5*3)+(4*7)+(3*6)+(2*0)+(1*7)=110 110 % 10 = 0 So 7376-07-0 is a valid CAS Registry Number.