The CAS Registry Mumber 64360-44-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,3,6 and 0 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 64360-44: (7*6)+(6*4)+(5*3)+(4*6)+(3*0)+(2*4)+(1*4)=117 117 % 10 = 7 So 64360-44-7 is a valid CAS Registry Number.