Class enterprise and others' wellbeing | Year 3

01 / LEARN

The idea, step by step

Money collected is not all spare money

A class enterprise makes or offers something, such as cards at a school stall. Planning means checking materials, prices, who will do the work and what the class will do with any money left.

Money collected from sales must be compared with the costs already paid. If the class collects 5 dollars but spent 2 dollars on materials, only 3 dollars remain after those costs.

A simple card-stall plan
Item	Calculation	Amount
Make 10 cards at 20 cents each	10 × 20 cents	2 dollars cost
Sell all 10 cards at 50 cents each	10 × 50 cents	5 dollars collected
Money left after materials	5 dollars − 2 dollars	3 dollars

Consider people as well as totals

A plan should consider its effect on others. The class might use some money for shared supplies, save for the next stall or support a chosen community purpose. There can be several reasonable choices.

State assumptions clearly. The table assumes every card sells and no other costs arise. Unsold cards still used materials. A fair plan does not promise that sales are certain or that every family must buy something.

A common trap

Treat every dollar from sales as money available to give away or spend again.

Instead: First subtract every stated cost, including materials used for unsold items. Then decide how to use what remains.

02 / WORKED EXAMPLES

See the thinking

Example 1

Find money left after costs

A class makes 10 cards. Each costs 20 cents to make and sells for 50 cents. All sell. How much remains after materials?

Materials cost $10 \times 20 = 200$ cents, or 2 dollars.
Sales collect $10 \times 50 = 500$ cents, or 5 dollars.
$500 - 200 = 300$ cents remain.

3 dollars remain after materials.

Example 2

Share and save

A stall collects 4 dollars in sales. Its materials cost 2 dollars. The class gives 1 dollar to its chosen community project. How much remains for the next stall?

First find what remains after materials: $4 - 2 = 2$ dollars.
Then subtract the 1-dollar gift: $2 - 1 = 1$ dollar.

1 dollar remains for the next stall.

Check your understanding

A stall collects 6 dollars. Materials cost 4 dollars. How much is left after costs?

Show answer

2 dollars.

$6 - 4 = 2$ . Sales money and spare money are different totals.

03 / WORKSHEET

Your turn

6 questions · Work at your own pace.

Worksheet PDF Worked solutions

Read the questions online

Six cards sell for 50 cents each. How much money is collected?
A class makes 10 cards costing 20 cents each. It sells only 6 for 50 cents each. How much remains after all materials costs?
After costs, a stall has 3 dollars. The class gives 1 dollar to a chosen project. How much is left?
Badges sell for 50 cents each. How many must sell to collect 4 dollars? This asks for sales money before costs.
The materials budget is 3 dollars. Card costs are 2 dollars 50 cents and labels cost 70 cents. A cheaper label set costs 40 cents. Which label set fits the budget?
A class has 2 dollars left after costs. Suggest a plan that considers other people and the next stall. Show that the plan uses no more than 2 dollars.

Read the worked solutions

Six cards sell for 50 cents each. How much money is collected?
$6 \times 50 = 300$ cents, or 3 dollars.
3 dollars.
A class makes 10 cards costing 20 cents each. It sells only 6 for 50 cents each. How much remains after all materials costs?
All materials cost $10 \times 20 = 200$ cents. Sales collect $6 \times 50 = 300$ cents. $300 - 200 = 100$ cents remain.
1 dollar.
After costs, a stall has 3 dollars. The class gives 1 dollar to a chosen project. How much is left?
$3 - 1 = 2$ dollars.
2 dollars.
Badges sell for 50 cents each. How many must sell to collect 4 dollars? This asks for sales money before costs.
4 dollars are 400 cents. Eight groups of 50 cents make 400 cents.
8 badges.
The materials budget is 3 dollars. Card costs are 2 dollars 50 cents and labels cost 70 cents. A cheaper label set costs 40 cents. Which label set fits the budget?
$250 + 70 = 320$ cents is too much. $250 + 40 = 290$ cents fits within 300 cents; $300 - 290 = 10$ .
The 40-cent labels fit, with 10 cents left.
A class has 2 dollars left after costs. Suggest a plan that considers other people and the next stall. Show that the plan uses no more than 2 dollars.
$1 + 1 = 2$ dollars. Another explained plan within the budget is acceptable.
For example, use 1 dollar for shared supplies and save 1 dollar for the next stall.

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Curriculum reference & lesson scope

Australian Curriculum v9 and SA Curriculum Mathematics

Dollars/cents; equivalent amounts; modelling purchases; needs/wants; class enterprise and others' wellbeing.

Official curriculum source ↗

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