Lesson 4: Revision and Practice

📘 Introduction

Congratulations on reaching the final lesson of Module 8! 🎉 In this revision, we will quickly review everything you have learned about measuring capacity, mass, time, and money.

After the review, you will find a set of practice exercises that combine all the skills you have gained. Let’s refresh your memory and get ready for real exam success!

🧠 Quick Review of Key Concepts

Measurement of Capacity

• Capacity is how much liquid a container can hold.
• Common units: litres (L) and millilitres (mL).
• 

Measurement of Mass

• Mass measures how heavy something is.
• Common units: grams (g), kilograms (kg), and tonnes (t).
• 
• 

Measurement of Time

• 1 minute = 60 seconds
• 1 hour = 60 minutes
• 24 hours = 1 day

Measurement of Money

• Ghanaian currency is in Ghana cedis (GH₵) and pesewas (Gp).
• 1 Ghana cedi (GH₵) = 100 pesewas (Gp)

📝 Mixed Practice Exercises

A. Capacity Questions

1. Convert 2.4 L into millilitres.
2. How many litres are in 4,500 mL?

B. Mass Questions

1. Convert 3.75 kg to grams.
2. A cow weighs 750,000 g. How many tonnes is that?

C. Time Questions

1. Convert 2 hours 30 minutes to minutes.
2. A program starts at 4:15 PM and ends at 7:00 PM. How long does it last?

D. Money Questions

1. Change 850 pesewas into Ghana cedis.
2. A pen costs GH₵2.50 and a book costs GH₵5.70. If you pay with GH₵10.00, how much change will you receive?

✅ Answers and Explanations

• 2.4 L × 1000 = 2400 mL
• 4500 ÷ 1000 = 4.5 L
• 3.75 × 1000 = 3750 g
• 750,000 ÷ 1,000,000 = 0.75 tonnes
• 2 hours 30 mins = (2 × 60) + 30 = 150 minutes
• 7:00 PM – 4:15 PM = 2 hours 45 minutes
• 850 Gp = GH₵8.50
• Total cost = GH₵2.50 + GH₵5.70 = GH₵8.20 → Change = GH₵10.00 – GH₵8.20 = GH₵1.80

🔁 Recap

Well done! You’ve revised measuring liquids, weights, time, and money. Always double-check your conversions and calculations, and practice applying them in everyday activities like shopping, cooking, traveling, and studying.

🪞 Reflection Prompt

Think of a day in your life from morning to evening. How many times did you use time, mass, capacity, or money? Describe two examples where correct measurement helped you.