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Data representation: binary arithmetic including addition and overflow
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20 CIE IGCSE Computer Science questions on Data representation: binary arithmetic including addition and overflow, each with instant feedback and a full examiner-style mark scheme.

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Question 1 · 1 mark · Difficulty 1/3

What is the result of the binary addition 0110 + 0101?

  1. 1011
  2. 1100
  3. 1001
  4. 1010
Show answer & explanation
✓ Answer: A — 1011
0110 (6) + 0101 (5) = 1011 (11). Starting from the rightmost bit: 0+1=1, 1+0=1, 1+1=10 (write 0 carry 1), 0+0+1=1, giving 1011. Option A (1010=10) is incorrect and reflects a carry error. Option C (1100=12) suggests an incorrect carry propagation. Option D (1001=9) reflects misalignment of bit positions during addition.
Question 2 · 1 mark · Difficulty 2/3

Which of the following best describes what happens to the stored result in an 8-bit register when overflow occurs during addition?

  1. The register stores an incorrect, truncated value as the carry is lost
  2. The register stores the correct sum with an extra bit appended
  3. The register stores the larger of the two original values
  4. The register stores the value zero as a default error state
Show answer & explanation
✓ Answer: A — The register stores an incorrect, truncated value as the carry is lost
When overflow occurs, the 9th (carry-out) bit cannot be stored in the 8-bit register and is lost, so the stored value is the lower 8 bits of the true result — an incorrect, truncated value. Option A is incorrect because registers have a fixed width and cannot expand. Option C is incorrect; the register does not default to zero. Option D is incorrect; the register stores the truncated sum, not one of the original operands.
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CIE IGCSE Computer Science: Data representation: binary arithmetic including addition and overflow FAQ

How many CIE IGCSE Computer Science questions on Data representation: binary arithmetic including addition and overflow are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Data representation: binary arithmetic including addition and overflow for CIE IGCSE Computer Science, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
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Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Data representation: binary arithmetic including addition and overflow practice with other Computer Science topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Data representation: binary arithmetic including addition and overflow questions aligned to the official CIE IGCSE Computer Science syllabus?
Every question is written against the published CIE IGCSE Computer Science specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Data representation: binary arithmetic including addition and overflow typically tested on CIE IGCSE Computer Science papers?
Data representation: binary arithmetic including addition and overflow appears across multiple question types on real CIE IGCSE Computer Science papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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