Grade 9 Percentage and Compound Unit Studio

Choose multipliers, recover original values, calculate simple interest, and preserve compound units.

Grade 9 · fictional financial and measurement contexts · no voice

Rate workspace

Complete every decision, then check the rate reasoning.

This pilot aligns only to uncovered Key Stage 3 records MAT-0284 and MAT-0286. It samples selected original percentage-change, original-value, simple-interest, speed, unit-price and density problems. It does not establish general financial fluency, reliable rate selection or independent transfer across unfamiliar compound-unit contexts. It does not complete the ratio, proportion and rates-of-change unit, provide a lesson sequence or satisfy an assessment.

⌂ Orco Academy
🧭 Middle · Grades 6–9 · Mathematics

How “Grade 9 Percentage and Compound Unit Studio” works

🎓 You are learning to: Choose multipliers, recover original values, calculate simple interest, and preserve compound units.

This studio works in three steps:

  1. 🎯 Choose a mission

    Each mission is a focused challenge from the menu at the top.

  2. 🧠 Decide and justify

    Select the option you could defend — which rule, definition or representation supports it?

  3. 🔁 Check, reflect, improve

    If the check finds an error, work out why before moving on. Finish by choosing the reason that shows how you know.

Missions in this studio: Calculate and interpret successive percentage change · Recover an original value after a percentage decrease · Calculate simple interest and final balance · Solve speed, unit-price and density problems

💡 Aim to explain your method, not just your answer.

Nothing you do here is saved or sent anywhere — experiment freely. Reopen this guide any time with the ? Help button.