From MEI comes **Ritangle**, a competition for teams of students of A level Mathematics, Scottish Highers or the International Baccalaureate. This year’s Ritangle competition launches Monday 2 October!

For the main competition, one question will be released daily for 21 consecutive weekdays, the first question will be released on 9th November 2017. I am looking forward to seeing the problems which I am sure will be of interest to many Mathematics students even if they are studying for alternative qualifications and cannot enter the competition.

Something which caught my eye is that **Technology** can help with some Ritangle questions which led me to some excellent Excel resources, which you can use whether or not you are participating in the competition.

Excel is a favourite for me – I use it in both my Mathematics teaching and in my Deputy Head role. Note from Nrich, we have many uses of **Excel for Mathematical Investigation**. I like this very clear illustration showing **fraction multiplication**.

Excel Interactive Resource – Fraction Multiplication

For teaching sequences, **Interactive Number patterns** will be useful.

Nrich – Interactive Number Patterns 2

…and one of my favourites – **Happy Numbers! (**For the Excel spreadsheet – **Nrich investigation**)

Talking of technology, the Excel fractions resources here reminded me to try fractions with Graspable Math. Having tried **Graspable Math** on the Interactive whiteboard recently I can confirm it works perfectly.

And finally, talking of Graspable Math, this led me recently to **Dave Taylor’s excellent Increasingly Difficult Questions**, a wonderful collection – and with an eye on the copying budget too!

Looking at the **Graspable Math Teacher Resources**, I see some of the Increasing Difficult Questions have been added to a canvas. Graspable Math lets you save your work so you can come back to it later or share it with others. Saving requires a google account. To share a file, use the share menu to get a link that gives others read access to a file. I decided I liked the idea of having a canvas ready for Simplifying Expressions, starting with **IDQ-Simplifying Expressions 1**, I opened it on my own canvas and adapted it slightly. I do like to keep all steps of the working displayed, so I have put the **exercises on the left, creating a good space on the right.**

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I would recommend to use GeoGebra instead of Excel. There are already so many resources that shows the possibility of GeoGebra like this german GeoGebraBook https://www.geogebra.org/m/aTAkuNaZ

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You will see from my GeoGebra pages and posts I agree GeoGebra is superb. For some investigations Excel can work really well too. I look forward to checking the book you mention.

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