The CAS Registry Mumber 63048-54-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,0,4 and 8 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 63048-54: (7*6)+(6*3)+(5*0)+(4*4)+(3*8)+(2*5)+(1*4)=114 114 % 10 = 4 So 63048-54-4 is a valid CAS Registry Number.