Help with BCD 7 segment display!!!

[chirag]

im using a 4 bit adder to get 4 bit result in bdc 7 segment display.if i get result in 2 digits, it displays corresponding alphabet which is not desired. Eg: if i add 7 and 8, i want to get 5 (unit's place) in 7 segment display and i want 1 (tens place) in 4 bit so i can display it in another 7 segment display.
how do i make my adder circuit, help please????

here: 7+8 (i want 5 in display and 1 as separate result)

 

[Harald Kapp]

7+5=15 which is "F" in hexadecimal notation. This is what the display shows.
Use the 4560 BCD adder chip for getting a result in BCD notation.