**The Main Challenge**

Follow the rules below and eliminate every number from a given list, except one.

Firstly, list the multiples of 10 from **10 to 100** inclusive, then eliminate:

- multiples of 4
- factors of 100
- multiples of 3

Which is the only number that remains?

**The 7puzzle Challenge**

The playing board of **the 7puzzle game** is a 7-by-7 grid containing 49 different numbers, ranging from **2 **up to **84**.

The 6th & 7th columns contain the following fourteen numbers:

5 7 9 24 28 30 32 36 40 49 50 54 64 66

How many multiples of 4 are listed?

**T****he Factors Challenge**

**The Mathematically Possible Challenge**

Using **1**, **3** and **9 **once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?

1 4 9 16 25 36 49 64 81 100

#*SquareNumbers*

**The Target Challenge**

Can you arrive at **352** by inserting **2**, **4**, **8**, **11** and **16** into the gaps on each line?

- (◯+◯)×(◯+◯)–◯³ = 352
- ◯²×◯×◯×◯÷◯ = 352

**Answers **can be found **here**.

**Click Paul Godding for details of online maths tuition.**