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# Largest Even

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Age 5 to 11

Challenge Level

The video below introduces this challenge:

You can have a go yourself using this interactivity:

To start with, the interactivity gives you one random digit.

Your task is to find the **largest possible two-digit even number** which uses the computer's digit, and one of your own.

Have a go several times.

**How are you deciding which digit to choose?**

**Can you decribe a strategy that means your first 'guess' is always correct?**

Clicking on the purple cog allows you to change the settings.

For a follow-on challenge, choose an *odd* two-digit target number (select 'Even False' in the settings).

**How are you deciding which digit to choose now?**

**Can you decribe your new strategy so your first 'guess' is always correct?**

You can explore the settings further to change:

- the number of digits in your target number
- the number of digits provided by the computer.

Let us know how your settings change your strategy.