Sorting algorithms compared

Trace bubble, insertion and merge sort by hand and count the comparisons each one needs to put a list in order.

⏱ 20 min❓ 9 questions

What you'll be able to do

✔I can trace one pass of bubble sort and one step of insertion sort
✔I can split and merge lists the way merge sort does and count its comparisons
✔I can compare how the number of comparisons grows for each algorithm

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:

🔘Multiple choice — Tap the answer you think is best, then check it.
🔢Number answer — Work out the answer and type the number.

👪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.

Curriculum: AC9TDI10P07