Binary patterns can represent numbers.
Convert the denary number 199 to 8-bit binary.
Mark scheme
Award one mark for each correct nibble in the correct order:
- 1100 (1)
- 0111 (1)
0 marks if the response is not 8-bit binary.
Example answers and how they were marked
Full marks2/2
1100 0111
Why: 199 = 128 + 64 + 4 + 2 + 1: both nibbles are correct (2).
Some marks1/2
1100 1000
Why: Converts 200 instead (a slip in adding up the place values). The first nibble is correct (1); the second is not.
No marks0/2
1110 0011
Why: The bits are written in reverse, smallest place value first. Neither nibble is correct.