The CAS Registry Mumber 1445-60-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,4,4 and 5 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1445-60: (6*1)+(5*4)+(4*4)+(3*5)+(2*6)+(1*0)=69 69 % 10 = 9 So 1445-60-9 is a valid CAS Registry Number.