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Exact values and approximations
Compare exact values such as √2 and π with their rounded decimal approximations and decide which form a situation calls for.
⏱ 18 min❓ 10 questions
What you'll be able to do
- ✔I can write answers exactly using surds and π, and as rounded decimal approximations
- ✔I can explain why a rounded decimal such as 1.41 or 3.14 is not the exact value
- ✔I can choose whether an exact value or an approximation suits a given situation
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
10 questions and 1 quick teaching card, including:
- 🔘Multiple choice — Tap the answer you think is best, then check it.
- ✅Select all that apply — More than one can be right — pick every option that fits.
👪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: AC9M10N01