The CAS Registry Mumber 1036628-11-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,3,6,6,2 and 8 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1036628-11: (9*1)+(8*0)+(7*3)+(6*6)+(5*6)+(4*2)+(3*8)+(2*1)+(1*1)=131 131 % 10 = 1 So 1036628-11-1 is a valid CAS Registry Number.