The CAS Registry Mumber 53412-07-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,4,1 and 2 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 53412-07: (7*5)+(6*3)+(5*4)+(4*1)+(3*2)+(2*0)+(1*7)=90 90 % 10 = 0 So 53412-07-0 is a valid CAS Registry Number.