Learning by Doing: CISCO Certified Network ... - SCN Research

Our next one: 13 - 32 = -19. Since this is negative we put a zero in the column heading
for 32 and move on to the next one.
2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
128 64 32 16 8 4 2 1
1 0 0
Our next one: 13 - 16 = -3. Since this is negative we put a zero in the column heading for
16 and move on to the next one.
2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
128 64 32 16 8 4 2 1
1 0 0 0
Our next one: 13 - 8 = 5. So we put a “1” under the 8 heading and move to the next
column heading.
2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
128 64 32 16 8 4 2 1
1 0 0 0 1
Our next one: 5 - 4 = 1. So we put a “1” under the 4 heading and move to the next
column heading.
2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
128 64 32 16 8 4 2 1
1 0 0 0 1 1
Our next one: 1 - 2 = -1. Since this is negative we put a zero in the column heading for 2
and move on to the next one.
2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
128 64 32 16 8 4 2 1
1 0 0 0 1 1 0
Our next one: 1 - 1 = 0. So we put a “1” under the 1 heading.
2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
128 64 32 16 8 4 2 1
1 0 0 0 1 1 0 1
And we are done…right? Wrong! We should always double-check our work. To do this
we convert from binary back to decimal. By adding the column headings:
128+8+4+1=141. It worked!
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