The CAS Registry Mumber 79053-48-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,0,5 and 3 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 79053-48: (7*7)+(6*9)+(5*0)+(4*5)+(3*3)+(2*4)+(1*8)=148 148 % 10 = 8 So 79053-48-8 is a valid CAS Registry Number.