**The Main Challenge**

From the following *Octaplus* clues, find the values of the letters **A to H**, each of which contains a different whole number in the range **1-30**:

- A is ten lower than the value of G, but three higher than C,
- C is half the value of B,
- B is six lower than H, but three higher than E,
- E is three times the value of F,
- F is three lower than D,
- D is five lower than A.

**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 & 3rd columns contain the following fourteen numbers:

4 12 13 15 17 21 22 27 35 55 56 60 80 81

Which four different numbers have a sum of exactly 100?

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

**The Mathematically Possible Challenge**

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

20 21 22 23 24 25 26 27 28 29

#*NumbersIn20s*

**The Target Challenge**

Can you arrive at **354** by inserting **2**, **3**, **4**, **5** and **10** into the gaps below?

- (◯×◯–◯)²+(◯×◯) = 354

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

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