Work through each section in order. Do not check the answers until you have attempted every question in that section. The method matters more than the final answer.
The column method for binary conversion should become automatic. Write the columns first every time — even when you think you know the answer. Skipping steps causes errors under exam pressure.
Most marks are lost not from wrong answers but from wrong method — missing column headings, leaving columns blank, or not showing carry digits in addition. The examiner marks your working.
Write out column values (128 64 32 16 8 4 2 1) for each question. Circle the 1s and add them up.
Q1=74 · Q2=177 · Q3=255 · Q4=45 · Q5=129 · Q6=214
Write column values first. Work left to right. Subtract as you go.
Q1=00101111 · Q2=11001000 · Q3=10000000 · Q4=01011101 · Q5=11111111 · Q6=00100001
Work right to left. Carry 1 into the next column when a sum exceeds 1. Show your carry digits.
Q1=01001000 · Q2=10010000 · Q3=11000000 · Q4=100000000 (overflow — result needs 9 bits)
Remember: split binary into groups of 4 from the right. Convert each group independently.
Binary→Hex: Q1=AA · Q2=CC · Q3=FF · Q4=5A | Hex→Binary: Q5=10100011 · Q6=11111111 · Q7=00101011 · Q8=01011100
Binary and hex questions are reliable marks in the exam. Miss ICT sessions practise the method until it becomes automatic, so exam pressure does not cause mistakes.
Typically 3–6 marks per question. Conversion questions usually award 1 mark per correct step. Showing method even with a wrong final answer can still earn marks.
128 64 32 16 8 4 2 1 — yes, memorise these. Writing them at the top of every binary question takes 10 seconds and prevents errors.
Not showing working. Students who write down column values and carry digits almost always get full marks. Students who try to do it in their head often lose marks.
Complete step-by-step explanation of binary, hex, and data representation.
The other major theory topic for GCSE Computer Science.
Sorting, searching, and pseudocode reference.
Structured revision sessions for the final weeks before exams.