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Binary search
Trace a binary search as it halves a sorted list, count its comparisons and see why it leaves linear search for dead on big data.
⏱ 20 min❓ 9 questions
What you'll be able to do
- ✔I can trace a binary search using low, high and mid positions
- ✔I can count the comparisons a binary search makes to find or miss a target
- ✔I can compare the worst cases of binary and linear search for large lists
How this works
- 1Read the short explanations first — they teach you what you need before each question.
- 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
- 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.
What's inside
9 questions and 1 quick teaching card, including:
- 🔢Number answer — Work out the answer and type the number.
- ↕️Put in order — Use the up and down arrows to sort the steps.
👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.
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Curriculum: AC9TDI8P04