Skip to main content
### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Compare the Cups

## Compare the Cups

#### Why do this problem?

Possible approach

#### Key questions

#### Possible extension

#### Possible support

Or search by topic

Age 5 to 7

Challenge Level

- Problem
- Getting Started
- Student Solutions
- Teachers' Resources

For this challenge, you will need lots of different cups. This picture shows some:

Which might you choose if you wanted a lot to drink? Why?

Which one would you choose if you did not want a lot to drink? Why?

Can you arrange the cups in a line from the one that holds the most liquid to the one that holds the least liquid?

How will you test whether you are right?

This practical activity offers a context in which children can develop their conceptual understanding of capacity.

Possible approach

For this activity, have a collection of cups/glasses/mugs available for the children to explore themselves. You may want to offer a context for the activity to link in with a current theme or story.

Pose some questions orally to the group, as in the problem, and encourage them to think about the answers by estimating and by eye at first. You could discuss their thinking and then give them the opportunity to test out their ideas, perhaps with water or sand.

In the plenary, you could pose a final challenge, such as how many of the smallest cup will be needed to fill the largest cup? Again, encourage estimation first before trying it out practically.

Tell me about your thinking.

How will you test out your ideas?

You could introduce a much, much smaller container, for example a spoon, and observe what the children do with it.

Some learners might need help with awkward pouring.