** The Main Challenge**

Here is an interesting logic puzzle for you to try.

Insert the numbers **1-9** into the correct positions in this 3-by-3 grid after studying the seven clues below. Each number should appear exactly once.

**x x x**

**x x x**

**x x x**

Here are the clues**:**

- The 2 is directly left of the 1,
- The 6 is directly right of the 7,
- The 8 is directly above the 9,
- The 9 is directly right of the 5,
- The 3 is further left than the 7,
- The 4 is directly below the 3,
- The 5 is in the very central position of the grid.

**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 1st & 4th columns contain the following fourteen numbers:

3 6 13 20 21 22 27 42 55 56 60 63 72 77

What is the difference between the sum of the lowest seven numbers and product of the two highest ones?

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

**The Mathematically Possible Challenge**

Using **5**, **6** and **12 **once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?

60 61 62 63 64 65 66 67 68 69

#*NumbersIn60s*

**The Target Challenge**

Can you arrive at **331** by inserting **1**, **3**, **11**, **13**, **31** and **33** into the gaps below?

- (◯–◯)×◯+◯–◯–◯ = 331

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

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