It's done! And ahead of schedule... (for once!)

A fully revised 2026 version of the Risps PDF eBook is now available for free, from

www.risps.co.uk

and from Payhip.

payhip.com/b/RGKPF

An early Ch-risp-mas present?

With best wishes of the season,

Jonny

Unexpected email from Jonny Griffiths telling me there's a new 2026 update of his RISPS book, that's great investigations for impressionable A Level students. Download it now from www.risps.co.uk with links to Geogebra and Excel files
@jonny-griffiths.bsky.social

Worked hard on a big revision of my risps. Weeding out mistakes, making tasks clearer, writing Geogebra and Excel files, all with better navigation; look out for the free eBook coming out in January!

Found this task somewhere on the net recently. I have an answer but my method is a bit tortured! Does anyone have a nice technique for this?

Nicely done, Rufus...

Hi Dominic, thriving this end in retirement, wishing you well, Jonny

Delighted to hear it! Jonny

Hi Rufus - glad you like the Risps. I am retired now and enjoying it! Jonny

Can you show c = (ab+1)/(a+b)?

Dipping my toe into this Blue Sky thing...

Hello! Anybody out there?

Jonny