The CAS Registry Mumber 38607-84-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,6,0 and 7 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 38607-84: (7*3)+(6*8)+(5*6)+(4*0)+(3*7)+(2*8)+(1*4)=140 140 % 10 = 0 So 38607-84-0 is a valid CAS Registry Number.