The CAS Registry Mumber 52483-25-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,2,4,8 and 3 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 52483-25: (7*5)+(6*2)+(5*4)+(4*8)+(3*3)+(2*2)+(1*5)=117 117 % 10 = 7 So 52483-25-7 is a valid CAS Registry Number.