LOGIC GATES and logic circuits in a calculator
Since this seems to be homework we won't give you a full answer but will guide you through.


Name the segments on your seven-segment display.




Figure 1. Standard segment naming. Image source: 7-segment display basics.


Next create a table to show what segments are required by each digit. e.g.  


Table 1. 7-segment decoder.

         Binary     Segment
Decimal  d c b a    A B C D E F G
      0  0 0 0 0    1 1 1 1 1 1 0
      1  0 0 0 1    0 1 1 0 0 0 0
      2  0 0 1 0    ....



Write the equations for each segment.
Draw the logic diagram.


Update your question with your work and we'll follow from there.