The CAS Registry Mumber 293735-69-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,9,3,7,3 and 5 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 293735-69: (8*2)+(7*9)+(6*3)+(5*7)+(4*3)+(3*5)+(2*6)+(1*9)=180 180 % 10 = 0 So 293735-69-0 is a valid CAS Registry Number.