The CAS Registry Mumber 90064-24-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,0,6 and 4 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 90064-24: (7*9)+(6*0)+(5*0)+(4*6)+(3*4)+(2*2)+(1*4)=107 107 % 10 = 7 So 90064-24-7 is a valid CAS Registry Number.