The CAS Registry Mumber 134150-67-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,4,1,5 and 0 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 134150-67: (8*1)+(7*3)+(6*4)+(5*1)+(4*5)+(3*0)+(2*6)+(1*7)=97 97 % 10 = 7 So 134150-67-7 is a valid CAS Registry Number.