I had to create a set of posters for school under the banner of Numeracy Across the Curriculum. Rather than try and provide tenuous examples of how students might use maths in every subject, I focused on where maths is (or can be) used in those fields more generally. We have them laminated on A4 and up in every relevant classroom.
Please feel free to use these posters in your own school if you like them.
This is the scheme of work I have introduced at my school. Please do not use it without reading all the surrounding material found here: https://jemmaths.wordpress.com/2016/08/15/adventures-in-mastery-2-writing-a-scheme-of-work/
I will be sharing supporting materials at some point too.
A basic flipchart with moveable algebra tiles, for demonstrating algebraic processes. See physical ones in use here: https://www.youtube.com/watch?v=LHrhFFEMEXo by @EmathsUK