The CAS Registry Mumber 36146-44-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,6,1,4 and 6 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 36146-44: (7*3)+(6*6)+(5*1)+(4*4)+(3*6)+(2*4)+(1*4)=108 108 % 10 = 8 So 36146-44-8 is a valid CAS Registry Number.