Comparing algorithm efficiency

Count the steps two algorithms take on the same problem, see how single and nested loops grow, and choose the more efficient one.

⏱ 20 min❓ 9 questions

What you'll be able to do

✔I can count how many times a loop body runs, including nested loops
✔I can compare how the step counts of two algorithms grow as the input grows
✔I can justify choosing the more efficient algorithm for a large input

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.
🔘Multiple choice — Tap the answer you think is best, then check it.

👪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: AC9TDI8P05