The CAS Registry Mumber 1262446-12-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,6,2,4,4 and 6 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1262446-12: (9*1)+(8*2)+(7*6)+(6*2)+(5*4)+(4*4)+(3*6)+(2*1)+(1*2)=137 137 % 10 = 7 So 1262446-12-7 is a valid CAS Registry Number.