The CAS Registry Mumber 101481-88-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,4,8 and 1 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 101481-88: (8*1)+(7*0)+(6*1)+(5*4)+(4*8)+(3*1)+(2*8)+(1*8)=93 93 % 10 = 3 So 101481-88-3 is a valid CAS Registry Number.