The CAS Registry Mumber 1204810-46-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,0,4,8,1 and 0 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 1204810-46: (9*1)+(8*2)+(7*0)+(6*4)+(5*8)+(4*1)+(3*0)+(2*4)+(1*6)=107 107 % 10 = 7 So 1204810-46-7 is a valid CAS Registry Number.