The CAS Registry Mumber 37005-78-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,0,0 and 5 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 37005-78: (7*3)+(6*7)+(5*0)+(4*0)+(3*5)+(2*7)+(1*8)=100 100 % 10 = 0 So 37005-78-0 is a valid CAS Registry Number.