**NB: This post has been updated twice. Disraeli said that if you want to become acquainted with a subject, write about it!!!! Mathspig’s head nearly exploded writing about this subject. But I’ve got it down to its simplest form now. One that Mathspig finally understands.**

**The Complaint**: Maths is really SCARY!…………….

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**The Cause**:

#### Some students think maths is always right or wrong and they are scared of making mistakes.

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**The Solution:**

#### Tackle problems that can’t be solved even by a computer. Students can only guess the answer and then test it. Anyone can make a guess. Work in groups. Every member of the group can contribute as students explore this maths.

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## The Challenge:……………………………………………………….

## Can you crack a security encryption code?….**…****………………………………………………..**

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**Topics:**

**Prime Numbers, Really BIG numbers……………………..**

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**Prime Numbers Hide Your Secrets: SLATE**

Remember the best online calculator is the **WEB 2.0 Calc.** NOTE: This is a secure website and you can check on its KEYCHAIN too.

You will find a fantastic list of Prime Numbers **here**.

**Crack a Security Code WORKSHEET & ANS**

Mathspig thanks Prof Kate Smith-Miles, Prof of Applied Maths, Monash University for the information about Keychains. Kate has used KEYCHAIN exercises with primary school students. They really enjoyed going home and showing their parents how to find a Keychain on the computer.