The CAS Registry Mumber 67567-47-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,5,6 and 7 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 67567-47: (7*6)+(6*7)+(5*5)+(4*6)+(3*7)+(2*4)+(1*7)=169 169 % 10 = 9 So 67567-47-9 is a valid CAS Registry Number.