The CAS Registry Mumber 24582-25-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,4,5,8 and 2 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 24582-25: (7*2)+(6*4)+(5*5)+(4*8)+(3*2)+(2*2)+(1*5)=110 110 % 10 = 0 So 24582-25-0 is a valid CAS Registry Number.