The CAS Registry Mumber 3078-04-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,0,7 and 8 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 3078-04: (6*3)+(5*0)+(4*7)+(3*8)+(2*0)+(1*4)=74 74 % 10 = 4 So 3078-04-4 is a valid CAS Registry Number.