The CAS Registry Mumber 70787-29-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,7,8 and 7 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 70787-29: (7*7)+(6*0)+(5*7)+(4*8)+(3*7)+(2*2)+(1*9)=150 150 % 10 = 0 So 70787-29-0 is a valid CAS Registry Number.