:Better Buy
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Approach: One to one Level: Year 4 and year 8
Focus: Value for money (cost per unit).
Resources: 100g Pebbles labelled with price $1.30; 50g Pebbles labelled with price 60¢; 20g Pebbles labelled with price 30¢.
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Questions/instructions:

Place the 100g and 50g boxes of Pebbles in front of the student.

In this activity you will be using some boxes of Pebbles.

The big box holds 100 grams of Pebbles and costs $1.30.

The smaller box holds 50 grams of Pebbles and costs 60 cents.

% responses
2001 ('97)
y4
y8
1. Which one is the better value for money?
Prompt: Which box would give you more Pebbles for the money?
50g box
64 (68)
83 (82)
2. Why is that box better value for money?

3. How do you know that?
correct, clear explanation
13 (10)
62 (65)
on right track but vague
9 (14)
10 (13)
Place the 20g box of Pebbles in front of the student.
4. This box costs 30 cents. Which is the better buy —this 20g box or this 100g?
100g box
•
76 (78)
Point to the 20g box.
5. If I wanted 100g of Pebbles, how many of these boxes would I need?
5
•
86 (90)
6. How did you work that out?
correct and clear
•
80 (83)

Commentary:
The results show substantial progress from year 4 to year 8, especially in ability to justify the choice made, with little change from 1997 to 2001 at either level.
 
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