1101 + 1000
10111 + 10001
11101 - 00101
10101 - 01111
10100 - 10000
010101 + 101011
111 - 010
10101 + 00001
00111 + 10111
11011 + 00111
= 11000
=100010
= 101000
101
= 10110
= 110
= 100
= 11110
= 1000000
= 10101
