** **For some excellent **Mathematical Puzzles and games resources **have a look at **Celebration of Mind**.

# Yohaku

For a new kind of puzzle **Yohakuu** is a puzzle that will test your number sense and problem solving skills. Each Yohaku puzzle is either an additive or a multiplicative puzzle. You must fill in the empty cells such that they give the sum or product shown in each row and column as well as satisfying a rule if given.

Choose from 2×2, 3×3 or 4×4 puzzles.

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These could be used as Starters or perhaps in form time.

Follow Yohaku on **Twitter**. Checking the Twitter stream I noted this algebraic puzzle below, an excellent idea. Try a little logic, where must c be placed for example.

# Statistics Games

A collection of Statistics games…

From Cambridge PhD student, Omar Wagih ‘**Guess the Correlation**‘, a rather addictive game with a purpose – Omar Wagih is collecting the data on the guesses collected and using it to analyse how we perceive correlations in scatter plots. Select About to read the rules and further details.

From **Statistics New Zealand**, come several **interactives for Probability and Statistics**. Each resource is accompanied by teachers’ notes. These interactives are part of **Schools Corner** which also includes **activities and resources**.

Try **Party Time Demo** from Harcourtschool.com to look at examples of biased and unbiased questions.

For early Probability and Statistics, see Statistics (at the bottom of the page) on **Science Kids**.

Try the Monty Hall problem on the Shodor site.

For a rather sophisticated use of games in the Statistics classroom for older students, see the Minitab Blog on **Using Games to Teach Statistics**. The Tangram Game and further details can be found **here**. Further activities are available under **Activities and Game-Based Labs**.

# More Lovely Puzzles!

To highlight some great puzzles…

Mathematics, Learning and Technology

A consistently popular post on this blog is ‘**Lovely Puzzles**‘ which has links to many puzzle sites which include mathematical puzzles. This seems a good time of year to investigate some of these further. A good puzzle for Christmas Eve perhaps (or any day!) would be ‘Make 24’.

Can you make 24? You must use all the numbers once and you are allowed the four operations and brackets.

(Further information and solutions for Make 24 and other Number puzzles are listed on the **Number page** on Mathematics Games). Number puzzles like this can make excellent starters.

Other possibilities for puzzle-type lesson starters come from **Erich Friedman** who has a variety of **Mathematical Puzzles; **try his **Weird Calculator Puzzles** for example or these **Number Formation Puzzles** both of which would make ideal ‘**Bell Work**‘.

Another **great collection comes from Simon Tatham**, I have been enjoying…

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# Transum Maths Puzzles

I couldn’t resist this counter moving challenge – happy to report that I scored 20! Evidence in the image!

Update: 19 is the new record!

You can try more puzzles from Transum **here**.

There are plenty to try, all are attractively presented and easy to use. Fun to do but these puzzles will help students practise a variety of mathematical skills.

Some of these puzzles would make good lesson starters, for example the **Magic Square puzzle** or **Prime Square**.

Note – this has been added to the **Puzzles page**.

# Light up the tree!

From Coolmath games – a logic game to keep you busy! **Can you light up the Christmas tree?**

# Spirograph

Play with the wonderful Spirograph!

As a child my Spirograph was definitely a favourite toy so I was delighted to find this **digital version, Inspirograph by Nathan Friend. **Try altering the gears so that the fixed and rotating gear are the same size, or make one size a factor of the other, make the two sizes have a common factor, or not! Investigate.

You can change the colours too and create a work of Art!

For some more Spirograph resources including from the awesome Desmos graphing calculator see **this post**.

# Core Skills

From Shane Hill, the creator of World Maths Day comes **Core Skills** for 4 to 10 year olds. This can be played on a PC or tablet and is free all year round.

# Find the Factors

For a puzzle with a difference which requires both logic and multiplication try a Find the Factors puzzle from Iva Sallay on her **Find the Factors blog. **In this Find the Factors 1-10 puzzle can you place the numbers 1 to 10 in the first row and the first column to make the multiplication table work? Iva Sallay has clearly explained the puzzles here: **How to Find the Factors**.

New puzzles are published each week, I like the Excel files provided with puzzles of varying levels of difficulty. You will also find many hints and tips in the various posts. See **Hooked on Factoring** for example, a post giving techniques for solving the puzzles and an Excel file of puzzles.

# You Can’t Do Simple Maths Under Pressure!

From **usvsth3m,** try this very popular game, **You Can’t Do Simple Maths Under Pressure!**

Can you choose the correct answer before the screen fills with orange?! There are ten levels – the game gets increasingly fast! Skills tested include basic operations and some simple time calculations.

If you master that, then try **You Can’t Do Binary Under Pressure!**

There is also a similar game for English – **You Can’t Write Proper English Under Pressure**.