Year 9 - Computer Science

Question 1

What are the column headings for an 8 Bit binary number

Answer 1

128
64
32
16
8
4
2
1

Question 2

What range of digits can be used in a Binary number column?

Answer 2

0
1

Question 3

Converting Denary to Binary

1) Draw a binary place value table
128 64 32 16 8 4 2 1

2) Keep subtracting the biggest place values you can until you’re left with 0

3) If you subtracted a place value, put a 1 in that column, otherwise put a 0

Convert 170 from denary to binary

Answer 3

128 64 32 16 8 4 2 1

170 - 128 = 42 place a 1 in 128
42 - 32 = 10 place a 1 in 32
10 - 8 = 2 place a 1 in 8
2 - 2 = 0 place a 1 in 2

128 64 32 16 8 4 2 1
1 0 1 0 1 0 1 0

Answer 1010 1010