The CAS Registry Mumber 76064-22-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,0,6 and 4 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 76064-22: (7*7)+(6*6)+(5*0)+(4*6)+(3*4)+(2*2)+(1*2)=127 127 % 10 = 7 So 76064-22-7 is a valid CAS Registry Number.