The CAS Registry Mumber 43182-59-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,3,1,8 and 2 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 43182-59: (7*4)+(6*3)+(5*1)+(4*8)+(3*2)+(2*5)+(1*9)=108 108 % 10 = 8 So 43182-59-8 is a valid CAS Registry Number.