The CAS Registry Mumber 80948-25-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,9,4 and 8 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 80948-25: (7*8)+(6*0)+(5*9)+(4*4)+(3*8)+(2*2)+(1*5)=150 150 % 10 = 0 So 80948-25-0 is a valid CAS Registry Number.