Computers manipulate binary patterns.
Convert the denary number 184 to 8-bit binary.
Mark scheme
Award one mark for each correct nibble in the correct order:
- 1011 (1)
- 1000 (1)
0 marks if the response is not 8-bit binary.
Example answers and how they were marked
Full marks2/2
1011 1000
Why: 184 = 128 + 32 + 16 + 8: both nibbles are correct (2).
Some marks1/2
1011 1001
Why: Converts 185 instead (a slip in adding up the place values). The first nibble is correct (1); the second is not.
No marks0/2
0001 1101
Why: The bits are written in reverse, smallest place value first. Neither nibble is correct.