7-Segment Display Need Help Immediately!! Please!!!

[Meso]

I can't figure out how I build this at all. I need so much help please! If anyone has any idea it would be great. I can't figure out how to make a keyboard on here or how to use the encoder and decoder correctly. Please help me.

Thank you much appreciated. 

[Tien_P]

Hi,

I didn't look through the entire assignment but I suggest you look up the datasheet for the 74147 and 7447.