I have enjoyed books for as long as I can remember and have been enjoying myself today organizing all the books I have in my Kindle library into collections on my new Kindle Paperwhite. I have several Maths books on my Kindle, many of which were free. Now you don’t have to own a Kindle to read Kindle books as the **Kindle app** is free to download for any device you may own: PC, phone or tablet. It is possible to search Kindle books by price, so a search on **Mathematics books by price from lowest to highest** will give all the free entries (worth keeping an eye on as these can change) first. It is worth noting that currently ** 50 mathematical ideas you really need to know **is available on Kindle for £1.54 UK $2.52 US.

Looking at the books currently on offer for free, these include some books from CK-12 (for more information on these see below), **Mind Hurdles: Mystery Number** – a set of ‘number mysteries’, one or more of which would make a good lesson starter and Henry Ernest Dudeney’s – **Amusements in Mathematics **a puzzle collection (with solutions). The first set of puzzles will offer a trip down memory lane for those who remember money – pre-decimal! There are several categories of puzzles available.

Having downloaded a CK-12 book I discovered another whole collection.** CK-12** provides an extensive range of open-source content and technology tools for students and teachers. See for example the **algebra resources here**; click on FlexBooks to see the available books. Books such as **CK-12 Algebra – second edition **can be downloaded free in various formats, PDF, mobi and ePub. To download books you will need to sign in (free); you can create an account or sign in with Google, Facebook or Twitter. Looking at the Algebra books, this looks useful: **Algebra Explorations for Pre-K through Grade 7** (so age 3 to 12)

There are many other free Maths books online as you will discover with a little searching, see **these** for example. A couple of free books I have mentioned before but I think are worth another mention:

The first is a **complete GCSE text from Clear Creative Learning**, don’t be put off by the 2007 date – this is still useful, note the link to download a free pdf. The text includes numerous set of questions for each topic by grade with solutions for all the examples.

The other is ‘**Street Fighting Mathematics**‘ by Sanjoy Mahajan, with the excellent sub-title ‘The Art of Educated Guessing and Opportunistic Problem Solving’ (note the link on the left to the **free Creative Commons edition** under Essential Info).

Any discussion on free Maths texts should include of course all the free texts available on the wonderful **CIMT** site (Centre for Innovation in Mathematics Teaching).

**Project Gutenberg **includes numerous Mathematics books, including classics such as **Flatland. **(Mark Twain’s comment on “Classic’ – a book which people praise and don’t read.” always amuses me!)

I wrote recently on the treasure trove that is the **National STEM Centre**; the resources here include books, the search function described in that post includes the facility to search by type and one of the options is textbook. **This search** for example is the result of searching for texts on equations.

You could **even write your own**! If publishing your own Kindle eBook feels a little too much right now – you could try something simpler!