The CAS Registry Mumber 150878-29-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,0,8,7 and 8 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 150878-29: (8*1)+(7*5)+(6*0)+(5*8)+(4*7)+(3*8)+(2*2)+(1*9)=148 148 % 10 = 8 So 150878-29-8 is a valid CAS Registry Number.