Additive Yohaku with rule

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.



Multiplicative Yohaku with ruleThese 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.

Algebraic Yohaku

By Colleen Young Posted in Algebra

Statistics Games

A collection of Statistics games…

Guess the Correlation

Guess the Correlation – Omar Wagih

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.

Statistics New Zealand - Statistics & Probability Games

Statistics New Zealand – Statistics & Probability Games

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.

Science Kids

Science Kids

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



Monty Hall - Shodor

Advanced Monty Hall – Shodor

Try the Monty Hall problem on the Shodor site.

Tangrams handout

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’.

Make 24 (1)

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‘.

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

View original post 115 more words

Transum Maths Puzzles

Transum Tweet

Select Image for Transum’s Pu Wiange puzzle

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

Update: 19 is the new record!Transum Pu Wiang Trophy

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.



Play with the wonderful Spirograph!

Mathematics for Students

Spirograph by Nathan Friend Spirograph by Nathan Friend

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.


View original post

Find the Factors

Find the Factors

Find the Factors Puzzles – Iva Sallay

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!

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.