The CAS Registry Mumber 103627-63-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,6,2 and 7 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 103627-63: (8*1)+(7*0)+(6*3)+(5*6)+(4*2)+(3*7)+(2*6)+(1*3)=100 100 % 10 = 0 So 103627-63-0 is a valid CAS Registry Number.