The CAS Registry Mumber 5969-48-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,9,6 and 9 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 5969-48: (6*5)+(5*9)+(4*6)+(3*9)+(2*4)+(1*8)=142 142 % 10 = 2 So 5969-48-2 is a valid CAS Registry Number.