The CAS Registry Mumber 15048-96-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,0,4 and 8 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 15048-96: (7*1)+(6*5)+(5*0)+(4*4)+(3*8)+(2*9)+(1*6)=101 101 % 10 = 1 So 15048-96-1 is a valid CAS Registry Number.