**Today’s Challenge**

Another **MATHELONA **challenge with a difference – no addition calculations at all.

Your task is to make all four lines work out arithmetically by replacing the 16 ◯’s with digits from 0 to 9. Each digit can only be inserted a maximum of twice:

◯ – ◯ = 9 = ◯ × ◯

◯ – ◯ = 7 = ◯ ÷ ◯

◯ – ◯ = 5 = ◯ × ◯

◯ – ◯ = 3 = ◯ ÷ ◯

Full details of our popular number puzzle can be found by clicking **MATHELONA**.

**T****he**** 7puzzle Challenge**

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

The 1st & 6th rows contain the following fourteen numbers:

2 5 9 12 14 15 18 20 22 33 40 49 56 72

Which two numbers, when doubled, are also on the list?

**Make 284 Challenge**

Can you arrive at 284 by inserting 5, 6, 8, 9 and 11 into the gaps below?

(◯²+◯²)×√◯–(◯+◯) = 284

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

**Click Paul Godding for details of online math tuition. Wherever you are in the world, please get in touch.**