Mathematics

Intermediate

50 mins

Teacher/Student led

Learning Goals

Learning Outcomes

Lesson Files

+75 XP

What you need:
IWB/Projector/Large Screen

Profit, Loss and Best-value Shopping

Learn to calculate profit and loss, and discover how to find the best-value shopping option by working out the unit price of different pack sizes.

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1 Getting Started
2 Watch and Notice
3 Try It Together
4 Work It in Your Copy
5 Class Challenge
6 What Did We Notice?
7 What's Next
Pupil practice

1 - Getting Started ~4 mins

Illustration for Getting Started Here are two ways to buy the same yoghurts: a 6-pack for €2.40, or single pots at 45c each. Hands up: which one do you think is the better buy? And how could you actually prove it, rather than just guessing?

👇 Mark your steps as done as you complete them.

+5 XP

2 - Watch and Notice ~9 mins

We work through four shelf-tag comparisons together. For each pair, share the pack price out to find the cost of just one, the unit price, and say which side wins and why. On the last one, predict the winner before the working is shown. Then we switch to a fundraising stall and look at profit and loss.

The bigger pack loses

👇 Mark your steps as done as you complete them.

+10 XP

3 - Try It Together ~10 mins

Key point

Remember: profit is selling above what something cost, and loss is selling below what it cost.

We work the first pair on the interactive together, then work the rest on the board:

On the interactive: €3.00 for 5 bars vs €4.55 for 7 bars
On the board: €4.50 for 3 bottles vs €7.00 for 5 bottles
On the board: Stall — a badge bought for €2, sold for €3.20
On the board: Stall — a scarf bought for €6, sold for €5

Which is the better buy?

+10 XP

4 - Work It in Your Copy ~3 mins

COPYBOOK MOMENT

First we work one pair together on the board so everyone sees the full method. Then in your maths copy, for each pair of shopping options write the unit price of both and circle the better value. After that, for each profit-and-loss example write three things one under the other:

Cost
Sale
Profit or Loss

Work out and label each one.

Board example first: €2.80 for 4 apples against €3.60 for 6 apples.

In your copy, pairs:

€4.00 for 8 yoghurts vs €2.70 for 5 yoghurts
€6.00 for 5 notebooks vs €3.60 for 4 notebooks

In your copy, profit and loss:

A badge costs €1.50 and sells for €2.25
A scarf costs €5 and sells for €4.20

+10 XP

5 - Class Challenge ~8 mins

Key point

Today we work through four comparisons on the board in order: a 6-pack against a 4-pack of the same drink, then two washing-powder boxes of different sizes, then a 20-pack of pens against a 10-pack, and finally a battery-pack twist.

After the four comparisons, we work a total-profit sum together on the board: a fundraising stall buys 20 wristbands at €2 each and sells them all at €3.50 — what is the total profit?

Best value and total profit

+15 XP

Pupil practice

Module 6 · Time and Money Measures

Lesson 71 · Profit, Loss and Best-value Shopping

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Profit, Loss and Best-value Shopping

Teacher Class Feed

1 - Getting Started ~4 mins

2 - Watch and Notice ~9 mins

The bigger pack loses

3 - Try It Together ~10 mins

Which is the better buy?

4 - Work It in Your Copy ~3 mins

5 - Class Challenge ~8 mins

Best value and total profit

Unlock the full learning experience

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