Computer Science · Oct / Nov 2025 · Paper 12 · Question 2
0478
As printed in the paper
The question as text
Two binary numbers are stored in a computer.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
2(a)[4]
One mark for each correct nibble (2)
One mark for a correct method of working for example 4 or 5 correct carries
One mark for showing an overflow error
(1) 111 1
11110101
001110011
0010 1110
2(b)[3]
One mark for showing the binary number after the shift
One mark for valid method of working to convert to denary
One mark for correct denary number
0001111016 + 8 + 4 + 230
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