The CAS Registry Mumber 149625-01-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,9,6,2 and 5 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 149625-01: (8*1)+(7*4)+(6*9)+(5*6)+(4*2)+(3*5)+(2*0)+(1*1)=144 144 % 10 = 4 So 149625-01-4 is a valid CAS Registry Number.