The CAS Registry Mumber 26048-96-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,6,0,4 and 8 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 26048-96: (7*2)+(6*6)+(5*0)+(4*4)+(3*8)+(2*9)+(1*6)=114 114 % 10 = 4 So 26048-96-4 is a valid CAS Registry Number.