The CAS Registry Mumber 1484-49-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,4,8 and 4 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 1484-49: (6*1)+(5*4)+(4*8)+(3*4)+(2*4)+(1*9)=87 87 % 10 = 7 So 1484-49-7 is a valid CAS Registry Number.