The CAS Registry Mumber 88510-47-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,8,5,1 and 0 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 88510-47: (7*8)+(6*8)+(5*5)+(4*1)+(3*0)+(2*4)+(1*7)=148 148 % 10 = 8 So 88510-47-8 is a valid CAS Registry Number.