The CAS Registry Mumber 150994-04-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,0,9,9 and 4 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 150994-04: (8*1)+(7*5)+(6*0)+(5*9)+(4*9)+(3*4)+(2*0)+(1*4)=140 140 % 10 = 0 So 150994-04-0 is a valid CAS Registry Number.